Adult Humans adult 135 aged human Middle Aged 129 Aged 121 Female 114 article 111 Male 109 female 109 male 107 controlled study 83 priority journal 79 middle aged 58 major clinical study 52 Adolescent 49 adolescent 45 Argentina 43 clinical article 39 Child 35 child 31 Aged, 80 and over 26 Animals 25 Young Adult 22 human tissue 22 Child, Preschool 21 Article 20 nonhuman 18 protein expression 16