1. Department of Ambulatory Surgery, Ghent University, Ghent, Belgium;
2. Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium;
3. Department of Gastroenterology, Ghent University Hospital, Ghent, Belgium;
4. Department of Gastrointestinal Surgery, Ghent University Hospital, Ghent, Belgium;
5. Faculty of Medicine and Health Sciences, Anesthesiology and Perioperative Medicine, Ghent University Hospital, Ghent, Belgium.