1. Department of General Surgery , Shengavit Medical Center , Yerevan , Armenia
2. Department of General & Laparoscopic Surgery , Yerevan State Medical University after M. Heratsi , Yerevan , Armenia
3. The Intervention Center , Oslo University Hospital , Oslo , Norway
4. Department of Research & Development, Division of Emergencies and Critical Care , Oslo University Hospital , Oslo , Norway
5. Department of Surgery N1 , Yerevan State Medical University after M. Heratsi , Yerevan , Armenia
6. Department of General and Abdominal Surgery , ArtMed MRC , Yerevan , Armenia
7. Oslo Centre for Biostatistics and Epidemiology , University of Oslo , Oslo , Norway
8. Department of Anesthesiology , ArtMed MRC , Yerevan , Armenia