Adult Humans 819 adult 819 human 819 female 705 male 664 Female 652 Male 613 young adult 394 Young Adult 387 middle aged 349 Middle Aged 344 adolescent 274 Adolescent 267 psychology 237 controlled study 236 Article 219 physiology 183 major clinical study 179 aged 170 article 170 Aged 155 procedures 136 child 121 human experiment 108 Child 107 questionnaire 102 cross-sectional study 87 diagnostic imaging 83 Cross-Sectional Studies 82