N E Samalavicius1,2, E Smolskas1, O Deduchovas1, V Janusonis3, A Dulskas2,4,5. 1. Department of Surgery, Klaipeda University Hospital, Klaipeda, Lithuania. 2. Faculty of Medicine, Institute of Clinical Medicine, Vilnius University, Vilnius, Lithuania. 3. Klaipeda University Hospital, Klaipeda, Lithuania. 4. Faculty of Health Care, University of Applied Sciences, Vilnius, Lithuania. 5. Department of Surgical Oncology, National Cancer Institute, Vilnius, Lithuania.