Article human 530 controlled study 493 male 396 Humans 364 female 342 adult 299 nonhuman 258 Male 189 Female 175 metabolism 149 animal experiment 136 major clinical study 135 unclassified drug 135 Animals 123 animal 123 clinical article 123 Adult 120 physiology 108 middle aged 106 priority journal 101 genetics 92 animal model 90 aged 89 human cell 87 Middle Aged 82 animal tissue 82 mouse 82 gene expression 81 diagnostic imaging 80