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COVID-19 (Coronavirus Disease 2019) free resource MedlinePlus Health Information https://medlineplus.gov/covid19coronavirusdisease2019.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=33818598.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33818598/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/33818598
Children's Health free resource MedlinePlus Consumer Health Information https://medlineplus.gov/childrenshealth.html
free resource scite Smart Citations https://scite.ai/reports/33818598
subscription/membership/fee required Silverchair Information Systems https://jamanetwork.com/journals/jamapediatrics/fullarticle/10.1001/jamapediatrics.2021.0161