adult article human female 530 male 522 Humans 500 Adult 440 Male 420 Female 408 controlled study 406 priority journal 384 Middle Aged 270 aged 226 clinical article 218 Aged 178 major clinical study 164 Adolescent 138 adolescent 134 Argentina 108 human cell 100 human experiment 94 middle aged 88 normal human 88 child 86 Young Adult 84 physiology 82 nonhuman 78 Child 74 case report 74 Animals 70