human 238 Humans 204 Article 113 female 72 adult 70 controlled study 70 male 69 Animals 51 animal 50 COVID-19 42 metabolism 35 aged 34 major clinical study 33 article 32 nonhuman 30 Female 29 biological model 25 Aged 22 Male 21 genetics 21 retrospective study 21 Adult 20 unclassified drug 20 SARS-CoV-2 19 child 19 human tissue 19 Models, Biological 18 Retrospective Studies 18 clinical article 18 cognition 18