1. Department of Faculty Surgery, Irkutsk State Medical University, Irkutsk, Russian Federation
2. Department of General Surgery and Anesthesiology, Irkutsk State Medical University, Irkutsk, Russian Federation
3. Department of Outpatient therapy and general practice, Irkutsk State Medical University, Irkutsk, Russian Federation
4. Department of Faculty therapy, Irkutsk State Medical University, Irkutsk, Russian Federation