1. Department of General Surgery, Irkutsk State Medical University, Irkutsk, Russia
2. Department of Phatology, Irkutsk State Medical University, Irkutsk, Russia
3. Department of Geriatrics, Propaedeutics and Management in Nursing, North-Western State Medical University Named after I.I. Mechnikov, Saint Petersburg, Russia
4. Department of Anesthesiology-Resuscitation, Irkutsk State Medical University, Irkutsk, Russia