Humans human male priority journal Male 354 article 287 female 285 controlled study 274 Female 272 adult 243 Adult 190 Middle Aged 164 aged 108 Aged 106 major clinical study 106 human cell 103 clinical article 94 nonhuman 81 Animals 72 Article 69 protein expression 64 Adolescent 60 Argentina 60 animal cell 51 metabolism 51 animal experiment 50 middle aged 50 human tissue 47 Young Adult 45 Mice 43