friendship human 10 Humans 9 female 7 male 7 Article 6 Child 6 child 6 major clinical study 5 Adolescent 4 Friends 4 adolescent 4 adult 4 controlled study 4 friend 4 peer group 4 Female 3 Male 3 Peer Group 3 article 3 depression 3 exploratory factor analysis 3 questionnaire 3 Depression 2 Intellectual Disability 2 Interpersonal Relations 2 Peer relationships 2 Social Support 2 Surveys and Questionnaires 2 affect 2