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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0140-6736(23)01252-7
COVID-19 (Coronavirus Disease 2019) free resource MedlinePlus Health Information https://medlineplus.gov/covid19coronavirusdisease2019.html
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0140-6736(23)01252-7