1. Division of Pediatric Critical Care Medicine, Department of Pediatrics, Hospital das Clínicas, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Avenida dos Bandeirantes 3900, 14049-900 Ribeirão Preto, SP, Brazil
2. Division of Urology, Department of Surgery and Anatomy, Hospital das Clínicas, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Avenida dos Bandeirantes 3900, 14049-900 Ribeirão Preto, SP, Brazil