Epidemiology of Perthes' disease.
D000293:Adolescent; D001955:British Columbia / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004739:England / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D007223:Infant; D007873:Legg-Calve-Perthes Disease / Q000453:epidemiology*; D008404:Massachusetts / Q000453:epidemiology; D009660:Northern Ireland / Q000453:epidemiology; D012959:Socioeconomic Factors; D014504:Urban Health