1. Department of Abdominal Surgery, National Military Medical Teaching Center of Ministry of Defense of Ukraine, Kyiv 01133, Ukraine
2. Department of Surgery, Bogomolets National Medical University, Kyiv 01601, Ukraine
3. Department of Thoraco-Abdominal Surgery, Military Medical Teaching Center of the Northern Region of Ministry of Defense of Ukraine, Kharkiv 61000, Ukraine
4. Department of Internal Medicine, Taras Shevchenko National University of Kyiv, Kyiv 03022, Ukraine
5. Department of Surgery, Taras Shevchenko National University of Kyiv, Kyiv 03022, Ukraine