1. Department of Surgery and Oncology, Faculty of Postgraduate Medical Education, Peoples’ Friendship University of Russia; Department of Coloproctology, Ilyinskaya Hospital
2. Department of Ultrasound Diagnostics, A.N. Ryzhikh National Medical Research Center of Coloproctology, Ministry of Health of Russia
3. Department of Coloproctology, Federal Research and Clinical Center for Specialized Medical Care and Medical Technologies, Federal Medical and Biological Agency of the Russian Federation
4. Center of Coloproctology, St. Aleksey Central Clinical Hospital
5. Department of Purulent Surgery and Coloproctology, M.P. Konchalovsky City Clinical Hospital, Moscow Healthcare Department