WITOLD WOŹNIAK*, ROBERT BAJNO, MICHAŁ ŚWIDER and PIOTR CIOSTEK First Department of General and Vascular Surgery, Second Faculty of Medicine with the English Division and the Physiotherapy Division, Medical University of Warsaw, Warsaw, Poland *Corresponding author: W. Woźniak, First Department of General and Vascular Surgery, Medical University of Warsaw, Warsaw, Poland; e-ma...