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free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S2214-109X(20)30264-3
Global Health free resource MedlinePlus Health Information https://medlineplus.gov/globalhealth.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32553130/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/32553130
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S2214-109X(20)30264-3