Affiliation: | 1.Department of General, Minimally Invasive and Elderly Surgery, Collegium Medicum, University of Warmia and Mazury, Niepodległości 44 St., 10-045, Olsztyn, Poland ;2.Department of Family Medicine and Infectious Disease, Collegium Medicum, University of Warmia and Mazury, Warszawska 30 St., 10-082, Olsztyn, Poland ; |