1. Department of Surgery and Proctology, Gastrointestinal Surgery, Shupyk National Medical Academy of Postgraduate Education, Kyiv, Ukraine
2. Department of Surgery and Proctology, Shupyk National Medical Academy of the Postgraduate Education, Kyiv, Ukraine
3. Kyiv Regional Clinical Hospital, Kyiv, Ukraine
4. Department of Surgery №1, National Pirogov Memorial University, Vinnytsya, Ukraine