Humans 282 Male Middle Aged adult human male 268 Female 250 female 237 Adult 222 article 214 controlled study 180 priority journal 164 aged 141 Aged 137 middle aged 134 major clinical study 101 clinical article 83 Adolescent 75 Argentina 66 adolescent 57 Article 50 Young Adult 46 human tissue 39 Child 37 child 36 Animals 34 Aged, 80 and over 32 physiology 32 genetics 30 human cell 29