human 429 Humans 268 female 226 male 211 adult 201 article 145 Female 124 Male 113 Article 107 Adult 91 controlled study 80 major clinical study 75 human experiment 67 middle aged 62 child 61 adolescent 59 psychology 57 Adolescent 51 aged 49 United States 46 young adult 46 Middle Aged 44 clinical article 43 Young Adult 39 questionnaire 38 procedures 37 Child 36 gender 36 perception 36 case report 34