1. Department of Surgery, Karolinska University Hospital, Huddinge and Ersta Hospital, Stockholm, Sweden
2. Department of Surgery and Medicine, University Hospital Kuopio, Kuopio, Finland
3. Department of Surgery, Trondheim University Hospital, Trondheim, Norway
4. Department of Surgery, Haukeland University Hospital, Bergen, Norway
5. Department of Surgery, Odense University Hospital, Odense, Denmark
6. Astra Zeneca Research and Development, Mölndal, Sweden