1. Department of Surgery, Helsinki University Central Hospital, Espoo, Finland
2. Central Hospital of Vaasa, Espoo, Finland
3. Central Hospital of Etelä-Saimaa, Espoo, Finland
4. Central Hospital of Päijgät-Häme, Espoo, Finland
5. Central Hospital of Jorvi Hospital, Espoo, Finland
6. Central Hospital of Maria Hospital, Helsinki, Finland
7. Central Hospital of Kuopio University Central Hospital, University of Helsinki, Finland
8. Department of Pharmacology and Toxicology, University of Helsinki, Finland