1. Department of Neonatal Surgery, Municipal Pediatric Hospital, Irkutsk, Russia.
2. Department of Pediatric Surgery, Irkutsk State Medical Academy of Continuing Education (IGMAPO), Irkutsk, Russia.
3. Department of Pediatric Surgery, State Medical University, Irkutsk, Russia.
4. Department of Pediatric Surgery, Municipal Pediatric Clinical Hospital, Kemerovo, Russia.
5. Department of Pediatric Surgery, Russian National Scientific Medical University, Moscow, Russia.