1. Clinic of Surgical Oncology, National Institute of Oncology – National Research Institute, Cracow Department, Cracow, Poland
2. Clinic of Endoscopic Surgery, Metabolic Surgery and Soft Tissue Tumors, Cracow
3. Department and Clinic of General Surgery and Clinical Nutrition, Center for Postgraduate Medical Education, Warsaw, Poland
4. Department and Clinic of General Surgery, Endocrine Surgery and Gastrointestinal Oncology of the Poznan University of Medical Sciences, Poznan, Poland
5. Clinic of General and Colorectal Surgery, Medical University of Lodz, Lodz, Poland
6. Department and Clinical Ward of General and Endocrine Surgery of the Specialist Hospital No 2 in Bytom, Poland
7. Clinic of General and Gastrointestinal Surgery and Surgical Oncology of the Collegium Medicum in Bydgoszcz, UMK Torun, Torun, Poland
8. Department of Surgical Oncology of the Collegium Medicum at the Nicolaus Copernicus University in Torun, Poland
9. Department and Clinic of Medical Microbiology, Medical University of Warsaw, Warsaw, Poland
10. 2nd Department and Clinic of General Surgery and Surgical Oncology at the Wroclaw Medical University, Wroclaw, Poland
11. Clinic of Endocrine Surgery of the 3rd Department of General Surgery at the Jagiellonian University Medical College in Cracow, Poland
12. Faculty of Medical Sciences and Health Sciences, Siedlce University of Natural Sciences and Humanities
13. Department of Surgery and Oncology at the Collegium Medicum of the University of Zielona Gora, Poland
14. Clinical Department of General and Colorectal Surgery and Multiple Organ Injury, St Barbara Voivodeship Hospital No 5 in Sosnowiec, Poland
15. Department of General Surgery and Nutritional Treatment SPSK No 4 in Lublin, Clinical Nutrition Laboratory of the Medical University of Lublin, Lublin, Poland
16. 1st Clinic of General and Endocrine Surgery, Medical University of Bialystok, Bialystok, Poland
17. Clinical Department of General Surgery, Surgical Oncology and Gastrointestinal Surgery at the University Hospital in Cracow, Poland
18. Clinic of General Surgery, Endocrine Surgery and Surgical Oncology of the Medical University of Warsaw, Warsaw, Poland
19. Clinic of General Surgery and Transplant Surgery of the Medical University of Lodz, Lodz, Poland
20. Clinic of Colorectal Surgery, General Surgery and Surgical Oncology, Center for Postgraduate Medical Education, Bielanski Hospital in Warsaw, Poland
21. Clinic of Surgery, Faculty of Health Sciences, Jagiellonian University Medical College in Cracow, Poland
22. Clinic of General Surgery, Surgical Oncology and Bariatric Surgery, Center for Postgraduate Medical Education, Prof. W. Orłowski Memorial Hospital in Warsaw, Poland
23. Department of General Surgery, Swissmed Hospital in Gdansk, Poland
24. Institute of Oncology in Bydgoszcz, Poland
25. Department and Clinic of General, Transplant and Liver Surgery of the Medical University of Warsaw, Warsaw, Poland
26. 2nd Department of General Surgery, Gastrointestinal Surgery and Gastrointestinal Cancer Surgery, Medical University of Lublin, Lublin, Poland