1. KHARKIV NATIONAL MEDICAL UNIVERSITY, KHARKIV, UKRAINE; SI «ZAYCEV V. T. INSTITUTE OF GENERAL AND URGENT SURGERY OF NATIONAL ACADEMY OF MEDICAL SCIENCE OF UKRAINE», KHARKIV, UKRAINE
2. KHARKIV NATIONAL MEDICAL UNIVERSITY, KHARKIV, UKRAINE
3. KARAZIN V. N. KHARKIV NATIONAL UNIVERSITY, KHARKIV, UKRAINE