1. Pediatric Urodynamic Centre; the First Affiliated Hospital of Zhengzhou University; Zhengzhou China
2. Department of Pediatric Surgery; the First Affiliated Hospital of Xinxiang Medical University; Weihui China
3. Department of Clinical Medicine; Aarhus University; Aarhus N Denmark
4. Department of Urology; University Medical Centre Utrecht; Utrecht The Netherlands
5. Department of Urology; Boston Children's Hospital; Boston Massachusetts