Postoperative analgesia for circumcision.
D000763:Anesthesia, Caudal; D000767:Anesthesia, Epidural; D002648:Child; D002675:Child, Preschool; D002944:Circumcision, Male / Q000009:adverse effects*; D006801:Humans; D008297:Male; D009407:Nerve Block; D010149:Postoperative Pain / Q000209:etiology / Q000517:prevention & control*; D010413:Penis; D011897:Random Allocation