1. Department of Gastroenterology; Herlev Hospital; University of Copenhagen; Copenhagen Denmark
2. Department of Surgery; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
3. Department of Surgery; Hillerød Hospital; University of Copenhagen; Copenhagen Denmark
4. Department of Surgery; Hvidovre Hospital; University of Copenhagen; Copenhagen Denmark
5. Digestive Disease Centre; Bispebjerg Hospital; University of Copenhagen; Copenhagen Denmark