Humans human 10,254 female 5,260 male 5,005 Female 4,381 adult 4,174 Male 4,101 Article 3,042 Adult 2,912 controlled study 2,638 middle aged 1,987 Middle Aged 1,888 procedures 1,689 major clinical study 1,630 young adult 1,626 article 1,593 Young Adult 1,578 adolescent 1,544 aged 1,488 Adolescent 1,482 child 1,367 physiology 1,299 Aged 1,250 Child 1,236 genetics 1,114 psychology 1,096 diagnostic imaging 1,065 human experiment 903 metabolism 856 pathology 837