1. Department of Faculty Surgery named after Professor A.A. Rusanov, Saint Petersburg State Pediatric Medical University, Saint Petersburg, Russian Federation
2. Department of Surgery, Nikolayevsky Hospital, Saint Petersburg, Russian Federation
3. Department of General Surgery with Course of Endoscopy, Saint Petersburg State Pediatric Medical University, Saint Petersburg, Russian Federation
4. Department of Polytrauma Surgery, Mariinsky Hospital, Saint Petersburg, Russian Federation
5. Fourth Department of Surgery, Saint Petersburg City Hospital #15, Saint Petersburg, Russian Federation