Article controlled study 151 human 143 male 141 female 114 Humans 101 adult 98 nonhuman 75 Male 66 Female 57 animal experiment 57 unclassified drug 46 Animals 42 animal 42 major clinical study 41 clinical article 40 animal model 38 mouse 37 aged 33 metabolism 33 animal tissue 32 middle aged 32 physiology 30 Adult 28 rat 27 priority journal 26 Middle Aged 24 chemistry 24 drug effect 23 human cell 23