1. Clinical Center of Serbia, First Surgical University Hospital, Clinic for Digestive Surgery, Department of Esophagogastric Surgery, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
2. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Mother and Child Health Care Institute of Serbia “Dr. Vukan Čupić”, Department of Abdominal Surgery, Belgrade, Serbia
3. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Mother and Child Health Care Institute of Serbia “Dr. Vukan Čupić”, Department of Pulmonology, Belgrade, Serbia
4. Mother and Child Health Care Institute of Serbia “Dr. Vukan Čupić”, Department of Abdominal Surgery, Belgrade, Serbia
5. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Mother and Child Health Care Institute of Serbia “Dr. Vukan Čupić”, Department of Anesthesiology and Intensive Therapy, Belgrade, Serbia