title: The activity period in group psychotherapy.
mesh_terms: D000293:Adolescent; D000374:Aggression; D002648:Child; D002653:Child Behavior Disorders / Q000628:therapy; D003863:Depression / Q000628:therapy; D006801:Humans; D008297:Male; D009518:New York; D010044:Outpatient Clinics, Hospital; D010379:Peer Group; D010817:Physician-Patient Relations; D011575:Psychoanalytic Therapy; D011615:Psychotherapy, Group; D011616:Psychotherapy, Multiple; D013177:Sports; D014477:Underachievement