Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 14 de 14
Filtrar
1.
Int J Nurs Stud Adv ; 6: 100180, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38746798

RESUMEN

Background: Enhancing the quality of therapeutic engagement between nurse and service user is related to positive impact on care, safety, and recovery outcomes. Achieving improved therapeutic engagement remains challenging in the acute mental health inpatient setting, characterised by complex social processes and contextual features that constrain behaviour change. The Therapeutic Engagement Questionnaire is an evidence-based tool co-produced with service users and nurses to improve therapeutic engagement. Objectives: The objectives of this quality improvement project were to identify the organisational and nursing behaviour changes associated with the Therapeutic Engagement Questionnaire and to understand the active behaviour change ingredients of the improvement tool and how they exert their influence. Design: A qualitative multi-site case study design in which data were collected from study site field notes and document review. Setting: Four acute mental health inpatient case study sites in England. Methods: Data referencing Therapeutic Engagement Questionnaire-linked behaviour change in project meeting field notes and documents from each study site were analysed using an inductive and deductive approach with thematic analysis. The Capability Opportunity Motivation-Behaviour model was employed as a theoretical framework. Findings: The therapeutic engagement tool had the capacity to prompt behaviour change across all three components of the behaviour change model: Capability - through nurses sharing good therapeutic engagement practice and use of statements in the questionnaire to build nurses' knowledge and skills; Opportunity - through organisational barriers being addressed and ward-level practice and culture changes; Motivation - through nurses' awareness of their influence on service user recovery, nurses' alertness to their therapeutic work, and connections between the therapeutic engagement tool and nursing core values. However, the tool did not accord with the values of some nurses, reported to be unmotivated by the recognition it gave their profession for contribution to service user recovery. In sites evidencing more prominent behaviour change, senior leader and ward-level agents of change played a valuable facilitative role. Conclusion: The therapeutic engagement tool had the potential to prompt behaviour changes at organisation and ward level and to the ways individual nurses therapeutically engage with service users, helping strengthen therapeutic engagement practice. Leadership at senior organisational and ward level was important to address contextual barriers to change. The project resulted in a conceptual framework to explain and understand the behaviour change techniques and functions linked to the therapeutic engagement tool. Longevity of the behaviour changes and their impact on service user quality of care requires future evaluation. Tweetable abstract: A therapeutic engagement tool can prompt organisational and nursing behaviour change in acute mental health inpatient settings.

2.
J Patient Rep Outcomes ; 7(1): 42, 2023 05 04.
Artículo en Inglés | MEDLINE | ID: mdl-37140730

RESUMEN

BACKGROUND: Cancer and its treatment can have significant impacts on health status, quality of life and functioning of patients. Direct information from patients regarding these aspects can be collected via electronic platforms in the form of electronic Patient Reported Outcome Measures (ePROMs). Research has shown that the use of ePROMS in cancer care leads to improved communication, better symptom control, prolonged survival and a reduction in hospital admissions and emergency department attendance. Acceptability and feasibility of routine ePROM collection has been reported by both patients and clinicians but to date their use has predominantly been limited to clinical trials. MyChristie-MyHealth is an initiative from a UK comprehensive cancer centre The Christie NHS Foundation Trust which incorporates the regular collection of ePROMs into routine cancer care. This study, carried out as part of a service evaluation, explores patient and clinician experiences of using the MyChristie-MyHealth ePROMs service. RESULTS: 100 patients with lung and head and neck cancers completed a Patient Reported Experience questionnaire. All patients reported that MyChristie-MyHealth was easy to understand and, almost all found it timely to complete and easy to follow. Most patients (82%) reported it improved their communication with their oncology team and helped them to feel more involved with their care (88%). A large proportion of clinicians (8/11) felt ePROMs helped communication with their patients and over half (6/10) felt they led to consultations being more patient focused. Clinicians also felt that the use of ePROMs resulted in patients being more engaged in consultations (7/11) and their cancer care in general (5/11). Five clinicians reported that the use of ePROMs altered their clinical decision making. CONCLUSIONS: Regular ePROMs collection as part of routine cancer care is acceptable to both patients and clinicians. Both patients and clinicians feel their use improved communication and increased the feeling of patient involvement with their care. Further work is needed to explore the experiences of patients that did not complete the ePROMs as part of the initiative and to continue to optimize the service for both patients and clinicians.


Asunto(s)
Neoplasias de Cabeza y Cuello , Calidad de Vida , Humanos , Oncología Médica , Participación del Paciente , Medición de Resultados Informados por el Paciente
3.
JCO Clin Cancer Inform ; 7: e2200150, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-37071029

RESUMEN

PURPOSE: The Christie NHS Foundation Trust launched their electronic patient-reported outcome measures (ePROMs) service in January 2019 in the routine clinical setting. The lung cancer questionnaires consist of 14 symptom items, adapted from the Common Terminology Criteria for Adverse Events (version 5.0) and the EuroQol EQ-5D-5L quality-of-life (QoL) tool. Patients with lung cancer are invited to complete questionnaires assessing their symptoms and QoL using an online platform. METHODS: The ePROM responses and clinical, pathologic, and treatment data for patients who completed the questionnaires between January 2019 and December 2020 were extracted from electronic medical records. The symptom and QoL scores of patients who completed baseline pretreatment ePROMs and also those who completed ePROMs pre- and postpalliative lung systemic anticancer therapy (SACT) or radical thoracic radiotherapy were evaluated. Pretreatment questionnaires were analyzed according to age, Eastern Cooperative Oncology Group performance status (ECOG PS), and Adult Comorbidity Evaluation-27 (ACE-27) comorbidity score. RESULTS: One thousand four hundred eighty patients with lung cancer were included. There were no statistically significant differences in symptoms and QoL scores between age groups. Cough (P = .006) and EQ-5D-5L mobility scores (P = .006) were significantly worse for patients with an ECOG PS of 0-1. Dyspnea (P = .035), hemoptysis (P = .023), nausea (P = .041), mobility (P = .004), and self-care (P = .0420) were significantly worse for those with higher ACE-27 scores (2-3 v 0-1). Palliative SACT was associated with a significant improvement in cough (P < .001) and hemoptysis (P = .025), but significantly negatively affected mobility (P = .013). Patients receiving radical thoracic radiotherapy reported a significant improvement in hemoptysis (P = .042) but worse pain (P = .002) and fatigue (P = .01). Other changes in symptom and QoL scores were not significant. CONCLUSION: The symptoms and QoL reported at baseline and before and after both palliative SACT and radical thoracic radiotherapy are clinically relevant and meaningful. We have demonstrated that routine implementation of ePROMs into clinical practice is feasible and can inform clinical practice and future research.


Asunto(s)
Neoplasias Pulmonares , Calidad de Vida , Adulto , Humanos , Tos , Hemoptisis , Neoplasias Pulmonares/diagnóstico , Neoplasias Pulmonares/terapia , Neoplasias Pulmonares/patología , Medición de Resultados Informados por el Paciente
4.
Int J Ment Health Nurs ; 31(6): 1467-1479, 2022 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-35976724

RESUMEN

A strong association exists between the quality of nurse-service user therapeutic relationship and care outcomes on acute mental health inpatient wards. Despite evidence that service users desire improved therapeutic engagement, and registered mental health nurses recognize the benefits of therapeutic relationships, such interactions remain sub-optimal. There is a dearth of evidence on factors influencing implementation of interventions to support and encourage therapeutic engagement. This study aimed to understand the barriers and enablers to implementation of the Therapeutic Engagement Questionnaire (TEQ), across fifteen acute inpatient wards in seven English mental health organizations. Qualitative methods were used in which data were collected from ethnographic field notes and documentary review, coded, and analysed using thematic analysis. Theoretical framing supported data analysis and interpretation. Reporting adheres to the Standards for Reporting Qualitative Research. The TEQ as an evidence-based intervention co-produced with service users and nurses was valued and welcomed by many nurse directors, senior clinicians, and ward managers. However, a range of practical and perceptual factors impeded implementation. Furthermore, many existing contextual challenges for intervention implementation in acute inpatient wards were magnified by the COVID-19 pandemic. Suitable facilitation to address these barriers can help support implementation of the TEQ, with some transferability to implementation of other interventions in these settings. Our study suggests several facilitation methods, brought together in a conceptual model, including encouragement of reflective, facilitative discussion meetings among stakeholders and researchers, effort put into winning nurse 'buy-in' and identifying and supporting ward-level agents of change.


Asunto(s)
COVID-19 , Salud Mental , Humanos , Pacientes Internos/psicología , Pandemias , Investigación Cualitativa , Encuestas y Cuestionarios
5.
Front Oncol ; 12: 835844, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35712515

RESUMEN

Background: Lung cancer survival remains poor. The introduction of Intensity-Modulated Radiotherapy (IMRT) allows treatment of more complex tumours as it improves conformity around the tumour and greater normal tissue sparing. However, there is limited evidence assessing the clinical impact of IMRT. In this study, we evaluated whether the introduction of IMRT had an influence on the proportion of patients treated with curative-intent radiotherapy over time, and whether this had an effect on patient survival. Materials and Methods: Patients treated with thoracic radiotherapy at our institute between 2005 and 2020 were retrospectively identified and grouped into three time periods: A) 2005-2008 (pre-IMRT), B) 2009-2012 (selective use of IMRT), and C) 2013-2020 (full access to IMRT). Data on performance status (PS), stage, age, gross tumour volume (GTV), planning target volume (PTV) and survival were collected. The proportion of patients treated with a curative dose between these periods was compared. Multivariable survival models were fitted to evaluate the hazard for patients treated in each time period, adjusting for PS, stage, age and tumour volume. Results: 12,499 patients were included in the analysis (n=2675 (A), n=3127 (B), and n=6697 (C)). The proportion of patients treated with curative-intent radiotherapy increased between the 3 time periods, from 38.1% to 50.2% to 65.6% (p<0.001). When stage IV patients were excluded, this increased to 40.1% to 58.1% to 82.9% (p<0.001). This trend was seen across all PS and stages. The GTV size increased across the time periods and PTV size decreased. Patients treated with curative-intent during period C had a survival improvement compared to time period A when adjusting for clinical variables (HR=0.725 (0.632-0.831), p<0.001). Conclusion: IMRT was associated with to more patients receiving curative-intent radiotherapy. In addition, it facilitated the treatment of larger tumours that historically would have been treated palliatively. Despite treating larger, more complex tumours with curative-intent, a survival benefit was seen for patients treated when full access to IMRT was available (2013-2020). This study highlights the impact of IMRT on thoracic oncology practice, accepting that improved survival may also be attributed to a number of other contributing factors, including improvements in staging, other technological radiotherapy advances and changes to systemic treatment.

6.
Radiother Oncol ; 160: 78-81, 2021 07.
Artículo en Inglés | MEDLINE | ID: mdl-33901563

RESUMEN

Outcomes of non-small cell lung cancer (NSCLC) patients with chronic obstructive pulmonary disease (COPD n = 587) and interstitial lung disease (ILD n = 34) treated with curative-intent radiotherapy were retrospectively investigated. Presence of ILD but not decreased forced expiratory volume in 1-second correlated with poor overall survival. Increased breathlessness and oxygen requirements after radiotherapy were observed in severe/very severe COPD and ILD.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Enfermedades Pulmonares Intersticiales , Neoplasias Pulmonares , Enfermedad Pulmonar Obstructiva Crónica , Carcinoma de Pulmón de Células no Pequeñas/complicaciones , Carcinoma de Pulmón de Células no Pequeñas/radioterapia , Humanos , Enfermedades Pulmonares Intersticiales/etiología , Neoplasias Pulmonares/complicaciones , Neoplasias Pulmonares/radioterapia , Enfermedad Pulmonar Obstructiva Crónica/complicaciones , Estudios Retrospectivos
7.
Complement Ther Med ; 55: 102605, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33220622

RESUMEN

Gut Directed Hypnosis (GDH) is a specialised form of hypnotherapy originally developed to reduce gastrointestinal (GI) symptoms in individuals with Irritable Bowel Syndrome (IBS). IBS is a condition characterised by symptoms including bloating, abdominal pain and diarrhoea and/or constipation as well as psychosocial symptoms such as depression and anxiety. Although the specific mechanism of action remains unclear, it is suggested that GDH works on the brain-gut axis to improve GI symptoms, psychological functioning and overall wellbeing. The present study aimed to expand upon the knowledge surrounding GDH by exploring practitioners' experiences of using GDH for IBS and their perceptions of how it impacts upon client wellbeing. Six practitioners trained in GDH participated in one hour semi-structured interviews. Thematic Analyses (TA) was used to analyse data. Three major themes emerged from data including: predisposing personality traits and vulnerabilities associated with IBS; GDH as evidence-based practice; and the future evolution of GDH. The findings from this study add to the growing body of literature exploring the use of GDH for IBS, by incorporating the perspective of practitioners working within this field.


Asunto(s)
Personal de Salud/psicología , Hipnosis/métodos , Síndrome del Colon Irritable/terapia , Australia , Humanos , Investigación Cualitativa
8.
J Clin Oncol ; 37(14): 1200-1208, 2019 05 10.
Artículo en Inglés | MEDLINE | ID: mdl-30920878

RESUMEN

PURPOSE: Prophylactic irradiation to the chest wall after diagnostic or therapeutic procedures in patients with malignant pleural mesothelioma (MPM) has been a widespread practice across Europe, although the efficacy of this treatment is uncertain. In this study, we aimed to determine the efficacy of prophylactic radiotherapy in reducing the incidence of chest wall metastases (CWM) after a procedure in MPM. METHODS: After undergoing a chest wall procedure, patients with MPM were randomly assigned to receive prophylactic radiotherapy (within 42 days of the procedure) or no radiotherapy. Open thoracotomies, needle biopsies, and indwelling pleural catheters were excluded. Prophylactic radiotherapy was delivered at a dose of 21 Gy in three fractions over three consecutive working days, using a single electron field adapted to maximize coverage of the tract from skin surface to pleura. The primary outcome was the incidence of CWM within 6 months from random assignment, assessed in the intention-to-treat population. Stratification factors included epithelioid histology and intention to give chemotherapy. RESULTS: Between July 30, 2012, and December 12, 2015, 375 patients were recruited from 54 centers and randomly assigned to receive prophylactic radiotherapy (n = 186) or no prophylactic radiotherapy (n = 189). Participants were well matched at baseline. No significant difference was seen in the incidence of CWM at 6 months between the prophylactic radiotherapy and no radiotherapy groups (no. [%]: 6 [3.2] v 10 [5.3], respectively; odds ratio, 0.60; 95% CI, 0.17 to 1.86; P = .44). Skin toxicity was the most common radiotherapy-related adverse event in the prophylactic radiotherapy group, with 96 patients (51.6%) receiving grade 1; 19 (10.2%), grade 2; and 1 (0.5%) grade 3 radiation dermatitis (Common Terminology Criteria for Adverse Events, version 4.0). CONCLUSION: There is no role for the routine use of prophylactic irradiation to chest wall procedure sites in patients with MPM.


Asunto(s)
Neoplasias Pulmonares/radioterapia , Mesotelioma/radioterapia , Neoplasias Pleurales/radioterapia , Neoplasias Torácicas/prevención & control , Neoplasias Torácicas/secundario , Pared Torácica/efectos de la radiación , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Neoplasias Pulmonares/patología , Masculino , Mesotelioma/patología , Mesotelioma Maligno , Persona de Mediana Edad , Neoplasias Pleurales/patología , Neoplasias Torácicas/radioterapia , Pared Torácica/patología
9.
Artículo en Inglés | MEDLINE | ID: mdl-32095576

RESUMEN

BACKGROUND: Treatment related toxicity is common after chemotherapy and radiotherapy. Our group has developed and validated an electronic Patient Reported Outcome questionnaire (ePRO) to assess symptoms and toxicity in lung cancer patients receiving (chemo)radiotherapy treatment. We assessed the need for volunteer support in clinics to assist patients in completing ePROs. METHODS: Lung Cancer patients attending outpatient or radiotherapy clinics at The Christie NHS Foundation Trust, Manchester were consented and asked to complete a Patient Reported Outcomes questionnaire using an electronic device (a touchscreen). Trained volunteers were available if patients required help such as verbal or physical assistance. The primary objective was to determine the need for volunteers to assist lung cancer patients in completing ePROs. RESULTS: 27/86 (31.4%) of patients who consented to this study required assistance to complete the ePRO. After questioning, we found that only 7/86 (8.1%) would have relied on volunteers for assistance as the majority of patients had a companion that could have provided help. 81/86 (94.2%) of patients were satisfied with the use of a touchscreen tablet to complete the ePRO. CONCLUSION: Our results demonstrate that the introduction of ePROs in lung cancer outpatient clinics is feasible, even without the use of volunteers for the majority of patients. The implementation of ePROs would allow large volumes of high quality (chemo)radiotherapy toxicity data to be collected accurately and quickly. This is essential for the development of predictive models of outcome using population-based data, which could allow the personalisation of (chemo)radiotherapy treatment for lung cancer patients.

11.
Radiother Oncol ; 112(2): 244-9, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-25107555

RESUMEN

BACKGROUND AND PURPOSE: There is a paucity of data regarding the feasibility and relevance of Patient Reported Outcome (PRO) tools to assess radiotherapy-related toxicity in lung cancer. MATERIAL AND METHODS: From January to June 2013, lung cancer patients undergoing thoracic radiotherapy/chemo-radiotherapy completed nine patient-adapted Common Terminology Criteria for Adverse Events (CTCAE), the European Organisation for Research and Treatment of Cancer Quality of Life (QoL) questionnaire and the Hospital Anxiety and Depression Scale (HADS) at baseline, the end of radiotherapy and at follow-up. Clinicians completed the same CTCAE items and agreement between patients' and clinicians' reporting was assessed using weighted kappa coefficients. QoL and HADS scores were correlated with the patients' and clinicians' reported toxicity. RESULTS: 70/116 patients completed the questionnaires for at least one time point excluding baseline. Agreement between patients' and clinicians' reported toxicity ranged from slight to substantial. Most discrepancies were within one grade and patients reported greater severity than clinicians for most symptoms. QoL and HADS scores were more strongly correlated with the patients' compared to clinicians' matching toxicity reports. The PRO tool was found to be statistically reliable. CONCLUSIONS: The use of a PRO tool in lung cancer radiotherapy is feasible, reliable and acceptable to patients. PROs should be integrated in future clinical trials evaluating new radiotherapy approaches to assess toxicity.


Asunto(s)
Neoplasias Pulmonares/radioterapia , Traumatismos por Radiación/diagnóstico , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Evaluación del Resultado de la Atención al Paciente , Calidad de Vida , Radioterapia/efectos adversos , Autoinforme , Encuestas y Cuestionarios
12.
Radiother Oncol ; 109(1): 8-12, 2013 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-24094626

RESUMEN

BACKGROUND AND PURPOSE: A variety of radiotherapy fractionations are used as potentially curative treatments for non-small cell lung cancer. In the UK, 55 Gy in 20 fractions over 4 weeks (55/20) is the most commonly used fractionation schedule, though it has not been validated in randomized phase III trials. This audit pooled together existing data from 4 UK centres to produce the largest published series for this schedule. MATERIALS AND METHODS: 4 UK centres contributed data (Cambridge, Cardiff, Glasgow and Sheffield). Case notes and radiotherapy records of radically treated patients between 1999 and 2007 were retrospectively reviewed. Basic patient demographics, tumour characteristics, radiotherapy and survival data were collected and analysed. RESULTS: 609 patients were identified of whom 98% received the prescribed dose of 55/20. The median age was 71.3 years, 62% were male. 90% had histologically confirmed NSCLC, 49% had stage I disease. 27% had received chemotherapy (concurrent or sequential) with their radiotherapy. The median overall survival from time of diagnosis was 24.0 months and 2 year overall survival was 50%. CONCLUSION: These data show respectable results for patients treated with accelerated hypo-fractionated radiotherapy for NSCLC with outcomes comparable to those reported for similar schedules and represent the largest published series to date for 55/20 regime.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas/radioterapia , Fraccionamiento de la Dosis de Radiación , Neoplasias Pulmonares/radioterapia , Adulto , Anciano , Anciano de 80 o más Años , Carcinoma de Pulmón de Células no Pequeñas/mortalidad , Femenino , Humanos , Neoplasias Pulmonares/mortalidad , Masculino , Persona de Mediana Edad , Planificación de la Radioterapia Asistida por Computador , Estudios Retrospectivos , Reino Unido
13.
Oncol Rep ; 14(6): 1631-3, 2005 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-16273268

RESUMEN

The management of glomus jugulare and tympanicum tumours is controversial due the long natural history and morbidity associated with intervention. We report the experience of radical radiotherapy (RT) alone for these tumours. Between 1965 and 1987, 49 patients received RT. Median age at presentation was 55 years (range, 23-82). Common presentations were deafness in 27 patients, tinnitus in 25 and cranial nerve palsies in 18. RT was given as a 2D simulator-planned wedge pair in the majority with a median dose of 45 Gy (range, 37.5-50.0) in 15 or 16 fractions over 21 days (range, 20-26). Median follow-up was 7.4 years (range, 2.0-23.4). At 6 months post-RT, complete clinical response was seen in 38 patients, partial response in 4, no response in 1 and no data were available for 6. At both 5 and 10 years, 92% of patients were recurrence-free and cancer-specific survival was 96%. There were no reports of radionecrosis. Although tumour eradication is not the aim, RT can achieve good local control, survival and symptom relief without the significant morbidity that can be associated with radical surgery. Therefore, RT alone has a significant role in the management of these tumours.


Asunto(s)
Neoplasias del Oído/radioterapia , Tumor del Glomo Yugular/radioterapia , Tumor del Glomo Timpánico/radioterapia , Adulto , Anciano , Anciano de 80 o más Años , Relación Dosis-Respuesta en la Radiación , Neoplasias del Oído/patología , Tumor del Glomo Yugular/patología , Tumor del Glomo Timpánico/patología , Humanos , Persona de Mediana Edad , Análisis de Supervivencia , Factores de Tiempo , Resultado del Tratamiento
14.
Radiother Oncol ; 77(1): 99-104, 2005 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-16216361

RESUMEN

BACKGROUND AND PURPOSE: Evaluation of effect of timing of external beam radiation therapy (EBRT) following surgery for craniopharyngioma. MATERIALS AND METHODS: Between 1976 and 2002, 87 patients (28 children) received EBRT in a regional referral centre. Forty-four patients received EBRT adjuvantly and 43 on relapse. The median total dose was 42.5Gy (range 34.7-52.5Gy) in 2.25-2.83Gy fractions over a median of 20 days (range 17-32). Effect of EBRT timing, type of original surgery, age on survival, progression-free survival (PFS) and quality of life (QOL) was studied. RESULTS: Survival from diagnosis was 86 and 76% and PFS was 78 and 66% at 10 and 20 years, respectively, with no significant difference seen between those treated adjuvantly or at relapse or according to age. QOL deteriorated significantly from diagnosis to last follow-up. Excluding patients who relapsed following EBRT, QOL did not deteriorate significantly overall (P=0.35). Children had worse QOL and greater morbidity at all timepoints compared to adults. CONCLUSIONS: EBRT is effective both adjuvantly and at relapse. QOL deteriorates over time-relapse following EBRT was the only significant factor. Children have greater morbidity compared to adults, but no evidence for greater EBRT-induced toxicity was seen.


Asunto(s)
Craneofaringioma/radioterapia , Craneofaringioma/cirugía , Neoplasias Hipofisarias/radioterapia , Neoplasias Hipofisarias/cirugía , Adolescente , Adulto , Factores de Edad , Anciano , Niño , Preescolar , Terapia Combinada , Supervivencia sin Enfermedad , Femenino , Humanos , Lactante , Masculino , Persona de Mediana Edad , Morbilidad , Recurrencia Local de Neoplasia/radioterapia , Radioterapia Adyuvante , Estudios Retrospectivos , Factores de Tiempo
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...