Aged Aged, 80 and over Humans 142 Male Young Adult adult 142 human 142 male 142 Adult 141 aged 141 female 140 very elderly 140 young adult 140 Female 139 Middle Aged 139 middle aged 138 Adolescent 92 adolescent 92 Article 65 major clinical study 59 controlled study 48 retrospective study 45 Retrospective Studies 38 child 32 Child 30 age 28 procedures 27 physiology 25 Age Factors 23 cohort analysis 22