Humans Male controlled study female human 346 male 344 Female 340 adult 278 article 256 priority journal 225 Adult 216 Middle Aged 161 major clinical study 107 Article 95 aged 93 clinical article 92 Aged 89 Argentina 73 Young Adult 73 nonhuman 72 Adolescent 71 Animals 68 middle aged 68 human cell 66 human experiment 58 physiology 56 adolescent 51 normal human 43 protein expression 41 Child 40