1. Department of Pediatric Surgery, Irkutsk Regional Pediatric Clinical Hospital, Irkutsk, Russia.
2. Irkutsk State Medical Academy of Continuing Education, Irkutsk, Russia.
3. Irkutsk State Medical University Russia, Irkutsk, Russia.
4. Department of Pediatric Surgery, Faculty of Health Sciences, Assuta University Medical Center, Ben Gurion University of the Negev, Ashdod, Israel.