Humans 326 Male Middle Aged human 322 Female 290 male 290 adult 282 female 257 Adult 246 article 244 controlled study 194 priority journal 192 Aged 159 aged 149 middle aged 146 major clinical study 111 clinical article 91 Adolescent 83 Argentina 72 adolescent 57 Young Adult 56 Article 54 Child 41 human cell 41 human tissue 41 Aged, 80 and over 40 Animals 40 child 36 nonhuman 35 physiology 34