1 Department of General, Minimally Invasive and Trauma Surgery, Franciszek Raszeja City Hospital, Poznań, Poland. Electronic address: jacekt.bialecki@gmail.com.
2 Department of General and Vascular Surgery, 3rd Provincial Hospital, Rybnik, Poland.
3 Department of Orthopedic, Oncological and Reconstructive Surgery, Medical University of Silesia, Regional Hospital, Sosnowiec, Poland.
4 Department of General, Gastroenterologic and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland.