1. Department of Faculty Surgery N 2 I.M.Sechenov First Moscow State Medical University Moscow Russia
2. Intervention Centre Oslo University Hospital Oslo Norway
3. Department of Surgery N1 Yerevan State Medical University after M. Heratsi Yerevan Armenia
4. Department of Surgery Yaroslavl State Medical University Yaroslavl Russia
5. Medical Faculty Institute of Clinical Medicine University of Oslo Oslo Norway
6. Department of Gastrointestinal Surgery Østfold Hospital Trust Grålum Norway