human Humans 172 Article 138 controlled study 111 metabolism 102 genetics 79 female 78 male 74 enzyme linked immunosorbent assay 70 adult 66 Female 57 Male 55 nonhuman 52 unclassified drug 52 human cell 51 middle aged 46 major clinical study 43 chemistry 42 Middle Aged 38 protein expression 38 pathology 35 Adult 34 Animals 34 animal 34 SARS-CoV-2 31 biological marker 31 drug effect 31 COVID-19 29 aged 28 gene expression 26