Male adult controlled study female human male 286 Female 282 Humans 276 Adult 216 article 210 priority journal 181 Middle Aged 155 major clinical study 101 aged 93 Aged 85 clinical article 84 Article 79 Adolescent 70 Young Adult 69 middle aged 64 physiology 55 Argentina 53 human experiment 53 adolescent 52 human cell 44 nonhuman 44 normal human 41 Animals 40 Child 32 genetics 32