1 Department of Abdominal and General Surgery and Oncology, National Cancer Institute, 1 Santariskiu Str., Vilnius, LT - 08660, Lithuania.
2 Department of Abdominal and General Surgery and Oncology, National Cancer Institute, 1 Santariskiu Str., Vilnius, LT - 08660, Lithuania; Clinic of Internal, Family Medicine and Oncology, Faculty of Medicine, Vilnius University, 1 Santariskiu Str., Vilnius, LT - 08660, Lithuania. Electronic address: audrius.dulskas@nvi.lt.
3 Clinic of Internal, Family Medicine and Oncology, Faculty of Medicine, Vilnius University, 1 Santariskiu Str., Vilnius, LT - 08660, Lithuania.
4 Departmen of Surgery, Klaipeda University Hospital, 41 Liepojos Str., LT-92288, Klaipeda, Lithuania.
5 Abdominal Surgery Department, Vilnius University Hospital Santaros Clinics, Vilnius, Lithuania.
6 Clinic of Internal, Family Medicine and Oncology, Faculty of Medicine, Vilnius University, 1 Santariskiu Str., Vilnius, LT - 08660, Lithuania; Departmen of Surgery, Klaipeda University Hospital, 41 Liepojos Str., LT-92288, Klaipeda, Lithuania; Health Research and Innovation Science Center, Faculty of Health Sciences, Klaipeda University, 84 H. Manto Str., LT- 92294, Klaipeda, Lithuania.