child female 60 human 60 male Humans 55 Child 50 Female 45 Male 44 major clinical study 32 adolescent 31 Adolescent 30 adult 27 controlled study 27 preschool child 27 Child, Preschool 25 Article 23 article 23 infant 20 Adult 18 Infant 15 psychology 15 human experiment 14 Young Adult 13 newborn 13 procedures 13 questionnaire 13 young adult 13 child parent relation 12 Middle Aged 11 dental procedure 11