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1.
J Nanosci Nanotechnol ; 20(8): 5276-5281, 2020 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-32126730

RESUMO

Mesoporous TiO2 films are synthesized through evaporation-induced self-assembly using poly(ethylene oxide-b-ε-caprolactone) diblock copolymers as a soft-template. Using small-angle X-ray scattering and scanning electron microscopy, we investigate the effect of the TiO2/PEO-b-PCL ratio on the resulting nanoarchitectonic structure. After sputter-coating Au and Pt layers, these Au/TiO2 and Pt/TiO2 nanocomposite films display drastically enhanced photodegradation of rhodamine 6G under ultraviolet irradiation, due to the metal films inhibiting the rapid recombination of photogenerated charge carriers.

2.
Phys Chem Chem Phys ; 22(9): 5293-5300, 2020 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-32096531

RESUMO

Transition metals and zeolites are extremely different catalysts used for methanol conversion. Zeolites are able to catalyze methanol conversion to hydrocarbons like gasoline and olefins, while transition metals show the selectivity of syngas. It is quite important to establish a general description from a catalysis point of view for a variety of catalysts. In this work, we have employed density functional theory calculations to correlate adsorption energies for all intermediates over a set of transition metals and zeolites. We have successfully unveiled the difference in chemical reactivity and catalytic activity for zeolites and transition metals; a comparative description has been finally established between the acidity (and porous effects) of zeolites and electronic (and geometrical) effects over transition metals. The hydrogen adsorption strength was suggested to be a general descriptor for both transition metal and zeolite catalysts. In addition, it was found that some zeolites with the same ammonia adsorption strength, which was always used to describe the acidity in experimental studies, are likely to have different theoretical acidity (hydrogen bonding strength). This eventually opens one more dimension for rational selection and design of zeolites for catalysis application.

3.
Nanotechnology ; 31(23): 235707, 2020 Mar 20.
Artigo em Inglês | MEDLINE | ID: mdl-32050193

RESUMO

Various nitrogen (N)-doped carbon materials have been designed as efficient photocatalysts. For the first time, polyimide (PI) aerogels were calcined to be N-doped carbon photocatalysts at different temperatures. The structures of the carbonized polyimide aerogels (CPIs) vary with the carbonization temperature. The conductivity of the CPI increases with the improvement of calcination temperature, whereas the N content of the CPI decreases and the N state also changes. Thus, the electronic properties of the CPI are changed. The photocatalytic experiments certified that the PI aerogel calcined at 800 °C exhibited the highest photocatalytic performance. The chlortetracycline (CTC) degradation rate over CPI-800 aerogel is 2.3 times as much as that of PI aerogel due to the changed structure and properties of the CPI-800 aerogel.

4.
Chemosphere ; 247: 125812, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-31972483

RESUMO

There emerges an urgent stipulation towards the enhanced toluene catalytic combustion nanocatalysts for whittling down the footprint of toluene, a notorious air pollutant. Unfortunately, Few materials which are currently made accessible both present the high catalytic performance lower than 250 °C and keep durable at elevated temperatures. Herein, we demonstrate an expeditious salt hydrolysis-driven redox-precipitation protocol wherein H+ donated by the hydrolysis of copper salt was used to initiate the regioselective reduction of KMnO4 by H2O2 under controlled redox kinetics in order to assemble the homogeneous mixed solid solution hollow microsphere Cu-Mn-based structure. Manifold characterization technologies unveil that in this unique nanbomicrosphere the abundant microscaled pores are successfully created across Cu-Mn bulks with fine-modulating the chemical properties. In sharp contrast with the compact counterparts without tailed porosity, the tuned crystallinity, accessed edge sites with the unsaturated coordination, fast redox chemistry, and boosted gaseous diffusion during reactions synergize to result in the signally good toluene oxidation, with the complete elimination activity at 252 °C, T90 at 237 °C, and prominent long-term durability under the stringent reaction atmospheres. Our current study ushers in an alternative and tractable arena to excogitate the porous oxide materials for multifarious catalysis implementations.

5.
Chemosphere ; 242: 125227, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31704522

RESUMO

It is crucial to explore the source, formation process and interdependence of disinfection byproducts (DBPs) to reduce their risk on public health. In this investigation, a source water was chlorinated to evaluate the initial formation rates and the maximum yields of trichloromethane (TCM), dichloroacetic acid (DCAA), and trichloroacetic acid (TCAA) based on a hyperbola model. The results showed that TCM achieved the highest initial formation rate and maximum theoretical concentration compared with DCAA and TCAA. The TCM yield can be used to forecast the yields of DCAA and TCAA throughout the whole reaction process, and the yields of chloral hydrate (CH), dichloroacetonitrile (DCAN) and 1,1,1-trichloropropanone (1,1,1-TCP) within the initial reaction stage. Besides, the raw water, settled water and filtered water collected from a drinking water treatment plant were divided into five fractions, respectively, by ultrafiltration membranes to evaluate their DBP formation after chlorination. Compared with the medium molecular weight species, high and low molecular weight organic matters exhibited relatively high specific regulated and unregulated DBP yields (expressed as µg/mg C), respectively. Humic acid-like compositions predominantly contributed to regulated DBP yields, while soluble microbial by-product-like compounds preferentially generated DCAN. The correlation study revealed that the TCM could also serve as an indicator for the measured DBPs from chlorination of sample fractions with different molecular weight. Finally, it was found that the theoretical cytotoxicity was enhanced during chlorination of filtered water compared with chlorination of settled water.


Assuntos
Desinfetantes/química , Desinfecção/métodos , Água Potável/química , Halogenação , Purificação da Água/métodos , Acetonitrilos/análise , Clorofórmio/análise , Ácido Dicloroacético/análise , Desinfetantes/análise , Água Potável/análise , Substâncias Húmicas/análise , Ácido Tricloroacético/análise , Ultrafiltração/efeitos adversos , Poluentes Químicos da Água/análise
6.
Curr Microbiol ; 77(2): 194-203, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31776652

RESUMO

A study of the induced effect of different types of weak magnetic field exposure on bacterial growth is performed, comparing the relative changes after removal from the magnetic fields. This investigation is relevant to understand the effect of magnetic field exposure on human beings due to electronic devices. For this purpose, we use four species of common bacteria in reference to human health and safety including Escherichia coli, Staphylococcus aureus, Staphylococcus epidermidis, and Pseudomonas aeruginosa. The choice of these four bacteria also allows us to check for effects which rely upon the Gram-staining properties or shapes of bacterial species. These species were initially exposed to static, non-homogeneous, and alternating weak magnetic fields, and then they were grown in incubators in the same environment at 37 °C simultaneously. Comparative measurements of optical density are then used to track the sustained impact on bacterial growth in the experimental samples. Bacteria were first grown in different weak magnetic fields on a plain glass surface both in liquid and solid media. Magnetic field-treated bacteria were then transferred into similar test tubes to grow in an incubator concurrently. Bacterial cultures in liquid nutrient broth on plain glass proliferated faster in most species. Different magnetic fields affect the growth pattern of bacteria differently, depending on the bacterial strain. The weak magnetic field seems to decelerate the growth rate, even after the magnetic field is removed. With application of this study, we can potentially investigate the effect of weak field exposures on Eukaryotic cells and gene dynamics.

7.
J Hazard Mater ; 384: 121385, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31606253

RESUMO

Recently, clean-up of resistant organic compounds has attracted growing attention. In this study, a novel heterogeneous ultrasound-enhanced sludge biochar catalyst/persulfate (BC/PS/US) process was firstly developed for the degradation of bisphenol A (BPA) in water. The results revealed that BC/PS/US process could successfully achieve a positively synergistic effect between sonochemistry and catalytic chemistry on the degradation of BPA compared to its corresponding comparative process. Nearly 98% of BPA could be degraded within 80 min at optimum reaction conditions. The coexisting substances including Cl-, SO42- and NO3- had no obvious inhibition on the BPA degradation, whereas HCO3- and humic acid (HA) had significant inhibition effects on that. PS decomposition of BC/PS/US process was superior to that of BC/PS or US/PS process. Both SO4- and HO participated in the degradation of BPA, but SO4- was predominant radical in the BC/PS/US process. A possible pathway of BPA degradation was proposed, and the BPA molecule was attacked by SO4- and degraded into five kinds of intermediate products through hydroxylation and demethylation processes. This study helps to comprehend the application of sludge biochar catalyst as a persulfate activator for the degradation of organic compounds under ultrasound irradiation, and provides a new strategy in wastewater treatment.

8.
J Formos Med Assoc ; 119(1 Pt 3): 471-479, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31300324

RESUMO

BACKGROUND/PURPOSE: This study assessed the quality of life (QoL) and pregnancy outcomes among infertile women undergoing in vitro fertilization (IVF) treatment to investigate the association between QoL and IVF pregnancy outcomes. METHODS: This study included 686 women with 1205 embryo transfers (ETs). QoL was measured using the fertility quality of life (FertiQoL) tool before ET. FertiQoL comprises two modules: a Core module (including mind/body, emotional, relational, and social domains) and a Treatment module (covering treatment environment and tolerability domains). The FertiQol total and subscale scores were computed and scored in the range of 0-100 (higher scores indicate better QoL). Multivariate generalized estimating equation analyses were carried out to assess the association between QoL and IVF pregnancy outcomes, with adjustment for time-varying factors across multiple ETs for a given person. RESULTS: The lowest score in the core module was for the emotional domain (62.0), and that in the Treatment module was for the tolerability domain (59.4). QoL scores were significantly and positively associated with pregnancy outcomes (i.e., ongoing pregnancy, live birth); with a one unit increase in the emotional domain score, the probabilities of ongoing pregnancy and live birth significantly increased by 2.4% and 2.6%, respectively (p < 0.05). CONCLUSION: This study evaluated the prospective association between QoL and IVF pregnancy outcomes among infertile women. The results highlight the importance of developing clinical strategies to improve QoL among infertile women undergoing IVF treatment, which may further improve the pregnancy rates of this population.

9.
BMJ Open ; 9(11): e032779, 2019 Nov 18.
Artigo em Inglês | MEDLINE | ID: mdl-31740474

RESUMO

OBJECTIVES: To detect the combined effects of lifestyle factors on work-related burnout (WB) and to analyse the impact of the number of weekend catch-up sleep hours on burnout risk in a medical workplace. DESIGN: Cross-sectional study. SETTING: Hospital-based survey in Taiwan. PARTICIPANTS: In total, 2746 participants completed the hospital's Overload Health Control System questionnaire for the period from the first day of January 2016 to the end of December 2016, with a response rate of 70.5%. The voluntary participants included 358 physicians, 1406 nurses, 367 medical technicians and 615 administrative staff. PRIMARY AND SECONDARY OUTCOME MEASURES: All factors that correlated significantly with WB were entered into a multinomial logistic regression after adjustment for other factors. The dose-response relationship of combined lifestyle factors and catch-up sleep hours associated with WB was explored by logistic regression. RESULTS: Abnormal meal time (adjusted OR 2.41, 95% CI 1.85 to 3.15), frequently eating out (adjusted OR 1.49, 95% CI 1.12 to 1.97), lack of sleep (adjusted OR 5.13, 95% CI 3.94 to 6.69), no exercise (adjusted OR 1.41, 95% CI 1.10 to 1.81) and >40 work hours (adjusted OR 2.72, 95% CI 2.08-3.57) were independently associated with WB (for high level compared with low level). As the number of risk factors increased (1-5), so did the proportion of high severity of WB (adjusted OR 1.39, 95% CI 0.45 to 4.27, to adjusted OR 32.98, 95% CI 10.78 to 100.87). For those with more than 7 hours' sleep on workdays, weekend catch-up sleep (≤0/>0 and ≤2/>2 hours) was found to be related to an increase of burnout risk (adjusted OR 4.91, 95% CI 2.24 to 10.75/adjusted OR 4.94, 95% CI 2.54 to 9.63/adjusted OR 6.74, 95% CI 2.94 to 15.46). CONCLUSION: WB in the medical workplace was affected by five unhealthy lifestyle factors, and combinations of these factors were associated with greater severity of WB. Weekend catch-up sleep was correlated with lower burnout risk in those with a short workday sleep duration (less than 7 hours). Clinicians should pay particular attention to medical staff with short sleep duration without weekend catch-up sleep.

10.
Opt Lett ; 44(19): 4698-4701, 2019 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-31568420

RESUMO

We report fabrication of a multifunctional photonic integrated chip on lithium niobate on insulator, which is achieved by femtosecond laser-assisted chemomechanical polish. We demonstrate a high-extinction-ratio beam splitter, a 1×6 optical switch, and a balanced 3×3 interferometer on the fabricated chip by reconfiguring the microelectrode array integrated with the multifunctional photonic circuit.

11.
Forensic Sci Int ; 305: 109964, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31630024

RESUMO

We introduce the Congruent Matching Profile Segments (CMPS) method for objective comparison of striated tool marks and apply it to bullet signature correlations. The method is derived from the congruent matching cell (CMC) method developed for the comparison of impressed tool marks. The proposed method is designed to increase comparison accuracy by addressing the comparison challenges caused by striae profiles with different lateral scales, varying vertical (height) scales, and sections that are poorly marked or have little to no similarity. Instead of correlating the entire profiles extracted from striated tool marks, the method divides one of the compared profiles into segments. Each segment is then correlated with the other profile. The CMPS method uses the normalized cross-correlation function with multiple correlation peak inspection to determine the number of profile segments that have both significant topography similarity and a congruent registration position. Initial tests were performed on the land engraved areas (LEAs) of 35 bullets fired from 10 consecutively manufactured pistol barrels. The results show clear separation between the CMPS scores of the 549 known non-matching (KNM) LEA profiles and the 46 known matching (KM) LEA profiles. These results are an improvement over those obtained using the correlation coefficient score of whole profiles. The large number of CMPS segment correlations may facilitate a statistical approach to error rate estimations.

12.
Micromachines (Basel) ; 10(9)2019 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-31540155

RESUMO

We demonstrate the fabrication of single-mode optical waveguides on lithium niobate on an insulator (LNOI) by optical patterning combined with chemomechanical polishing. The fabricated LNOI waveguides had a nearly symmetric mode profile of ~2.5 µm mode field size (full-width at half-maximum). We developed a high-precision measurement approach by which single-mode waveguides were characterized to have propagation loss of ~0.042 dB/cm.

13.
Sensors (Basel) ; 19(19)2019 Sep 22.
Artigo em Inglês | MEDLINE | ID: mdl-31546747

RESUMO

In industrial production, soft sensors play very important roles in ensuring product quality and production safety. Traditionally, global modeling methods, which use historical data to construct models offline, are often used to develop soft sensors. However, because of various complex and unknown changes in industrial production processes, the performance of global models deteriorates over time, and frequent model maintenance is difficult. In this study, locally weighted partial least squares (LWPLS) is adopted as a just-in-time learning method for industrial soft sensor modeling. In LWPLS, the bandwidth parameter h has an important impact on the performance of the algorithm, since it decides the range of the neighborhood and affects how the weight changes. Therefore, we propose a two-phase bandwidth optimization strategy that combines particle swarm optimization (PSO) and LWPLS. A numerical simulation example and an industrial application case were studied to estimate the performance of the proposed PSO-LWPLS method. The results show that, compared to the traditional global methods and the LWPLS with a fixed bandwidth, the proposed PSO-LWPLS can achieve a better prediction performance. The results also prove that the proposed method has apparent advantages over other methods in the case of data density changes.

14.
Nanoscale ; 11(39): 18169-18175, 2019 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-31556893

RESUMO

The search for high efficiency and low-cost catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is vital to overall water splitting. In this work, on the basis of first-principles calculations, we screened a series of late transition metal atoms supported on a C9N4 monolayer (TM@C9N4, where TM represents Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ir, and Pt) as electrocatalysts for both the HER and OER. Our results demonstrate that the TM atoms can be bonded with the nitrogen atoms around the hole to form stable structures, and the bonded TM atoms are stable against diffusion. Co@C9N4 exhibits high catalytic activity toward the HER. In particular, the N active sites in the Co@C9N4, Ni@C9N4, and Pt@C9N4 systems demonstrate relatively high performance for the HER. However, Co@C9N4 and Pt@C9N4 exhibit low OER activities with large overpotentials. Among the ten cases of TM@C9N4 considered here, only Ni@C9N4 performs as a promising bifunctional electrocatalyst with N and Ni atoms as catalytic active sites for the HER and OER, with a calculated hydrogen adsorption Gibbs free energy (ΔGH*) of -0.04 eV and an OER overpotential (ηOER) of 0.31 V. The results demonstrate that TM@C9N4 is a promising single-atom catalytic system, which can be used as the non-noble metal bifunctional electrocatalyst for overall water splitting.

15.
Chemosphere ; 237: 124487, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31398605

RESUMO

A hybrid process was proposed for carbofuran (CBF) degradation, a carbamate pesticide with a special refractory property, through peroxymonosulfate (PMS) activation under visible LED (Vis LED) by FeIII impregnated N-doped TiO2 photocatalyst (FeNT). An in-depth investigation was conducted to examine the synergistic effect of the FeNT/PMS/Vis LED process under various reaction conditions. An increase in the rate constant was observed with the increment of pH from 2.4 to 7.4, implying the feasibility of the process at neutral pH. A further increase in pH from 8.9 to 11 showed a sudden drop in the rate constant (if the role of base activation is ignored). The efficiency of CBF degradation is still more than 70% after adding NO3-, SO42-, HCO3-, and Cl-. Interestingly, the efficiency was not influenced even after the further increment of nitrate concentration. Furthermore, the high chloride concentrations caused an enhanced efficiency due to the generation of reactive halogens through two-electron transfer. Sixteen major intermediates were recognized and eight of them were never reported in the previous studies. Surprisingly, a new degradation pathway was noted in this study via H-abstractions and cyclization mechanisms. The FeNT/PMS/Vis LED process exhibited a dual functionality in terms of mineralization efficiency and about 90% TOC reduction can be achieved. Therefore, these findings provide new insights into the mechanism of PMS activation under Vis LED after coupling non-metal doped TiO2 photocatalyst with a metal component, and its implications for degradation of refractory and non-biodegradable pollutants in wastewater.


Assuntos
Carbofurano/química , Peróxidos/química , Poluentes Químicos da Água/química , Compostos Férricos , Águas Residuárias , Poluentes Químicos da Água/análise
16.
Micromachines (Basel) ; 10(9)2019 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-31454927

RESUMO

Three-dimensional (3D) printing has allowed for the production of geometrically complex 3D objects with extreme flexibility, which is currently undergoing rapid expansion in terms of materials, functionalities, as well as areas of application. When attempting to print 3D microstructures in glass, femtosecond laser-induced chemical etching (FLICE)-which is a subtractive 3D printing technique-has proved itself a powerful approach. Here, we demonstrate the fabrication of macro-scale 3D glass objects of large heights up to ~3.8 cm with an identical lateral and longitudinal feature size of ~20 µm. The remarkable accomplishment is achieved by revealing an unexplored regime in the interaction of ultrafast laser pulses with fused silica, which results in depth-insensitive focusing of the laser pulses inside fused silica.

17.
Neuron ; 103(5): 836-852.e5, 2019 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-31277925

RESUMO

Polarized, non-overlapping, regularly spaced, tiled organization of radial glial cells (RGCs) serves as a framework to generate and organize cortical neuronal columns, layers, and circuitry. Here, we show that mediator of cell motility 1 (Memo1) is a critical determinant of radial glial tiling during neocortical development. Memo1 deletion or knockdown leads to hyperbranching of RGC basal processes and disrupted RGC tiling, resulting in aberrant radial unit assembly and neuronal layering. Memo1 regulates microtubule (MT) stability necessary for RGC tiling. Memo1 deficiency leads to disrupted MT minus-end CAMSAP2 distribution, initiation of aberrant MT branching, and altered polarized trafficking of key basal domain proteins such as GPR56, and thus aberrant RGC tiling. These findings identify Memo1 as a mediator of RGC scaffold tiling, necessary to generate and organize neurons into functional ensembles in the developing cerebral cortex.

19.
Zhongguo Gu Shang ; 32(5): 434-439, 2019 May 25.
Artigo em Chinês | MEDLINE | ID: mdl-31248238

RESUMO

OBJECTIVE: To investigate the methods and clinical effects of autologous iliac bone transplantation, platelet-enriched plasma(PRP) and extracorporeal shock wave(ESW) in the treatment of nonunion. METHODS: From January 2015 to December 2016, 60 patients with nonunion were treated, including 41 males and 19 females, aged 18 to 42 years old with an average age of 29 years old. Patients with nonunion were divided into autologous bone transplantation treatment group(control group), autologous bone transplantation and platelet-rich plasma(PRP) combined with extracorporeal shock wave(ESW) treatment group(experimental group). The callus formation, local complications, final growth of fracture and Johner-Wruhs functional classification of operative limbs of the two groups were compared 3 months after operation. RESULTS: Fifty-five patients were followed up, 27 in the control group and 28 in the experimental group, 5 patients were lost. The follow-up period ranged from 8 to 24 months. The callus score in the control group was significantly lower than that in the experimental group at 3 months after operation(P<0.05). There was no swelling and infection in the skin of the iliac bone acquisition site and non-union operation site in both groups. The clinical and bone healing time of the control group was significantly longer than that of the experimental group(P<0.05). In the experimental group, 28 patients achieved bone union; in the control group, 24 patients achieved bone union, and 3 patients had bone nonunion again. The excellent and good rate of Johner-Wruhs functional classification of affected limbs in the control group was significantly lower than that in the experimental group(P<0.05). CONCLUSIONS: Autologous iliac bone transplantation combined with platelet-enriched plasma(PRP) and extracorporeal shock wave(ESW) has a certain effect in the treatment of bone nonunion after fracture surgery. It can significantly improve the formation of new bone. It is a comprehensive and useful way to treat bone nonunion after fracture surgery in clinical work.


Assuntos
Fraturas não Consolidadas , Adolescente , Adulto , Transplante Ósseo , Feminino , Consolidação da Fratura , Humanos , Ílio , Masculino , Plasma Rico em Plaquetas , Transplante Autólogo , Adulto Jovem
20.
World Neurosurg ; 129: e429-e435, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31150855

RESUMO

OBJECTIVE: To evaluate the 30-day outcomes of using the Enterprise stent to treat patients with hypoperfusion of symptomatic severe intracranial stenosis. METHODS: Patients with symptomatic severe intracranial stenosis (70%-99%) who underwent Enterprise stent intervention between August 2014 and November 2018 were retrospectively analyzed. The 30-day primary outcomes included the success rate of stenting and the incidence of complications, including ischemic stroke, cerebral hemorrhage, and death. The 30-day complication rates of patients with different lesion locations and classifications of Mori morphology were compared. RESULTS: Sixty-eight patients were treated using 70 Enterprise stents. The success rate was 100%. The 30-day complication rate was 4.4%. The rates of ischemic stroke, cerebral hemorrhage, and death were 1.5%, 2.9%, and 0%, respectively. No significant difference was found in the 30-day complication rate between patients with different lesion locations and classifications of Mori morphology (P > 0.05). CONCLUSION: Enterprise stents were relatively safe in treating patients with hypoperfusion of symptomatic severe intracranial stenosis.


Assuntos
Arteriopatias Oclusivas/cirurgia , Isquemia Encefálica/etiologia , Hemorragia Cerebral/etiologia , Procedimentos Endovasculares/métodos , Stents , Acidente Vascular Cerebral/etiologia , Idoso , Arteriopatias Oclusivas/complicações , Procedimentos Endovasculares/efeitos adversos , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/etiologia , Estudos Retrospectivos , Resultado do Tratamento
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