1. Copenhagen University Hospital Hvidovre; Gastrounit, Surgical Division; Kettegaards Alle 30 Hvidovre Denmark 2650
2. Bispebjerg Hospital, University of Copenhagen; Department of Radiology R; 23 Bispebjerg Bakke Copenhagen Denmark DK 2400 NV
3. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care; PO Box 85500 Utrecht Netherlands 3508 GA Utrecht
4. Bispebjerg Hospital; Department of Surgical Gastroenterology K; Bispebjerg Bakke 23 Copenhagen NV Denmark DK-2400