Male human Humans 839 male 829 Female 723 article 669 female 657 adult 562 controlled study 498 Adult 497 priority journal 494 Middle Aged 322 Aged 219 Animals 219 aged 199 Adolescent 194 major clinical study 194 human cell 193 Argentina 181 nonhuman 181 clinical article 172 physiology 158 Article 153 adolescent 149 middle aged 148 Child 144 Young Adult 137 animal 131 child 130 Human 119