Aged Humans female human 167 Female 165 aged 153 Male 151 male 151 Middle Aged 143 article 141 adult 133 Adult 107 priority journal 102 controlled study 99 middle aged 60 major clinical study 58 clinical article 52 Argentina 39 Adolescent 37 Aged, 80 and over 37 adolescent 33 Child 27 clinical trial 22 Animals 21 child 21 Prospective Studies 20 human cell 19 protein expression 19 Severity of Illness Index 18 risk factor 18