1. Department of Medical Decision Making, Leiden University Medical Center, the Netherlands (PJM, JD-E, WO, JK)
2. TNO Quality of Life, BU Prevention and Health, Section Health Promotion, Leiden, the Netherlands (WO)
3. Federation of Patients and Consumer Organisations in the Netherlands (NPCF), Utrecht, the Netherlands (MV)
4. Department of Surgery, Bronovo Hospital, The Hague, the Netherlands (HJS)
5. Department of Surgery, Diaconessenhuis Leiden, the Netherlands (RV)