[1] Natl Res Inst, Natl Inst Oncol, Cracow Dept, Clin Surg Oncol, Krakow, Poland
[2] Metab Surg & Soft Tissue Tumors, Clin Endoscop Surg, Krakow, Poland
[3] CMUJ, Dept Surg 2, Krakow, Poland
[4] Ctr Postgrad Med Educ, Dept & Clin Gen Surg & Clin Nutr, Warsaw, Poland
[5] Poznan Univ Med Sci, Dept & Clin Gen Surg Endocrine Surg & Gastrointes, Poznan, Poland
[6] Med Univ Lodz, Clin Gen & Colorectal Surg, Lodz, Poland
[7] Specialist Hosp 2 Bytom, Dept & Clin Ward Gen & Endocrine Surg, Bytom, Poland
[8] UMK Torun, Coll Med Bydgoszcz, Clin Gen & Gastrointestinal Surg & Surg Oncol, Torun, Poland
[9] UMK Torun, Coll Med Bydgoszcz, Clin Gen & Gastrointestinal Surg & Surg Oncol, Torun, Poland
[10] Lukaszczyk Mem Oncol Ctr Bydgoszcz, Dept Surg Oncol, Bydgoszcz, Poland
[11] Med Univ Warsaw, Dept & Clin Med Microbiol, Warsaw, Poland
[12] Wroclaw Med Univ, Dept & Clin Gen Surg & Surg Oncol 2, Wroclaw, Poland
[13] Univ Hosp, Clin Dept Gen Surg, Krakow, Poland
[14] Jagiellonian Univ Med Coll Cracow, Dept Gen Surg 3, Clin Endocrine Surg, Krakow, Poland
[15] Siedlce Univ Nat Sci & Humanities, Fac Med Sci & Hlth Sci, Siedlce, Poland
[16] City Hosp SP ZOZ Siedlce, Dept Gen Surg, Siedlce, Poland
[17] Univ Zielona Gora, Coll Med, Dept Surg & Oncol, Zielona Gora, Poland
[18] Univ Hosp Zielona Gora, Clin Gen Surg & Surg Oncol, Zielona Gora, Poland
[19] St Barbara Voivodeship Hosp 5 Sosnowiec, Clin Dept Gen & Colorectal Surg & Multiple Organ, Sosnowiec, Poland
[20] Med Univ Lublin, Clin Nutr Lab, Dept Gen Surg & Nutrit Treatment SPSK 4 Lublin, Lublin, Poland
[21] Med Univ Bialystok, Clin Gen & Endocrine Surg 1, Bialystok, Poland
[22] Univ Hosp Cracow, Clin Dept Gen Surg Surg Oncol & Gastrointestinal, Krakow, Poland
[23] Med Univ Warsaw, Clin Gen Surg, Endocrine Surg & Surg Oncol, Warsaw, Poland
[24] Med Univ Lodz, Clin Gen Surg & Transplant Surg, Lodz, Poland
[25] Bielanski Hosp Warsaw, Ctr Postgrad Med Educ, Clin Colorectal Surg, Gen Surg & Surg Oncol, Warsaw, Poland
[26] Jagiellonian Univ Med Coll Cracow, Clin Surg, Fac Hlth Sci, Krakow, Poland
[27] Prof W Orlowski Mem Hosp Warsaw, Ctr Postgrad Med Educ, Clin Gen Surg, Surg Oncol & Bariatr Surg, Warsaw, Poland
[28] Swissmed Hosp Gdansk, Dept Gen Surg, Gdansk, Poland
[29] Inst Oncol Bydgoszcz, Bydgoszcz, Poland
[30] Med Univ Warsaw, Dept & Clin Gen Transplant & Liver Surg, Warsaw, Poland
[31] Med Univ Lublin, Dept Gen Surg Gastrointestinal Surg & Gastrointes, Lublin, Poland