human 13,420 Humans 10,269 female 6,819 male 6,535 adult 5,685 Article 4,456 Female 4,390 Male 4,116 controlled study 3,803 article 3,169 Adult 2,912 major clinical study 2,350 middle aged 2,225 Middle Aged 1,888 aged 1,823 young adult 1,752 procedures 1,716 adolescent 1,701 human experiment 1,675 child 1,636 Young Adult 1,578 Adolescent 1,488 clinical article 1,353 physiology 1,319 Aged 1,255 Child 1,240 genetics 1,147 psychology 1,112 diagnostic imaging 1,075 questionnaire 935