1. Finnish Office for Health Technology Assessment, National Institute of Health and Welfare, Helsinki, Finland
2. Department of Surgery, Central Hospital of Central Finland, Jyväskylä, Finland
3. Department of Computer Science and Information Systems, University of Jyväskylä, Jyväskylä, Finlanland
4. Department of Gastrointestinal Surgery, Helsinki University Central Hospital, HUC, Helsinki, Finland