1. Division of Pediatric Urology and Andrology of the Department of Uroandrology and Human Reproductive Health, 344022 Rostov-on-Don, Russia
2. Department of Uroandrology, Regional Children’s Clinical Hospital, 344015 Ros-tov-on-Don, Russia
3. Department of Pediatric Surgery, University Children’s Hospital Basel, Spitalstrasse 33, 4056 Basel, Switzerland