1. Department of Surgery, Academic Medical Centre, Amsterdam, The Netherlands
2. Department of Gastroenterology and Hepatology, Academic Medical Centre, Amsterdam, The Netherlands
3. Department of Medical Psychology, Academic Medical Centre, Amsterdam, The Netherlands
4. Department of Quality Assurance and Process Innovation, Academic Medical Centre, Amsterdam, The Netherlands
5. Department of Surgery, Free University Medical Centre, Amsterdam, The Netherlands
6. Department of Surgery, Isala Clinics, Zwolle, The Netherlands