1. Department of Surgery, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark.
2. Department of Pathology, Roskilde Hospital, University of Copenhagen, Roskilde, Denmark.
3. Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark.
4. Digestive Disease Center, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark.
5. Department of Surgery, Herlev Hospital, University of Copenhagen, Herlev, Denmark.