Male adult controlled study human Humans 320 male 320 Female 304 female 300 article 252 Adult 248 priority journal 210 Middle Aged 188 aged 114 major clinical study 108 Aged 106 clinical article 96 Article 82 Young Adult 78 Adolescent 74 middle aged 66 Argentina 60 human cell 58 physiology 58 adolescent 56 human experiment 56 nonhuman 54 Animals 50 normal human 44 human tissue 40 genetics 36