[Hydronephrosis in children due to mucosal flap valve at the pelvicoureteric junction, with statistical evaluation of hydronephrosis in children in Japan].
D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000453:epidemiology* / Q000209:etiology*; D007223:Infant; D007564:Japan; D007668:Kidney / Q000002:abnormalities*; D008297:Male; D009092:Mucous Membrane / Q000002:abnormalities; D014513:Ureter / Q000002:abnormalities*