title: Case sampling at a children's psychiatric clinic.
mesh_terms: D000293:Adolescent; D001741:Black or African American; D000367:Age Factors; D044383:Black People; D002648:Child; D002653:Child Behavior Disorders / Q000453:epidemiology; D002662:Child Health Services / Q000706:statistics & numerical data*; D002675:Child, Preschool; D005006:Ethnicity; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology; D009497:Neurotic Disorders / Q000453:epidemiology; D011567:Psychiatric Department, Hospital / Q000706:statistics & numerical data*; D012017:Referral and Consultation; D012737:Sex Factors; D013019:South Africa