human Humans 524 female 346 male 331 adult 308 Female 234 article 224 Male 220 Article 178 Adult 171 controlled study 165 major clinical study 119 human experiment 118 middle aged 112 young adult 108 Young Adult 102 adolescent 102 Middle Aged 97 physiology 89 Adolescent 87 child 85 aged 77 psychology 73 procedures 65 Child 60 Aged 59 priority journal 49 diagnostic imaging 45 United States 44 cross-sectional study 44