The paediatrician, the paediatric surgeon, and the ureter.
D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis / Q000209:etiology; D008131:London; D008297:Male; D010372:Pediatrics; D014513:Ureter / Q000002:abnormalities*; D014515:Ureteral Diseases / Q000150:complications / Q000151:congenital* / Q000601:surgery; D014517:Ureteral Obstruction / Q000209:etiology; D014552:Urinary Tract Infections / Q000209:etiology; D014718:Vesico-Ureteral Reflux / Q000209:etiology