1. General Surgery Unit, Stanley Dudrick’s Memorial Hospital, Skawina, Poland
2. School of Medicine, University of Zagreb, Croatia
3. General Surgery and Gastrointestinal Surgery, Atatürk Teaching and Research Hospital, Ankara, Turkey
4. School of Medicine, Aristotle University of Thessaloniki, Greece
5. Vilnius University Hospital Clinic of Anaesthesia and ICU, Vilnius, Lithuania
6. Anaesthesiology and Intensive Care Clinic, Tartu University Hospital, Tartu, Estonia
7. Department of Gastrointestinal Surgery, Lublin Regional Cancer Centre, and Department of Surgery and Surgical Nursing, Medical University, Lublin, Poland
8. Center of Clinical Nutrition, University Hospital Zagreb, Zagreb, Croatia
9. Department of Anesthesiology and Intensive Care, Ege University Hospital, Izmir, Turkey
10. Laiko Hospital, Athens, Greece
11. Department of Epidemiology, Jagiellonian University Medical College, Krakow, Poland