1. Department of Gastrointestinal Surgery, Helsinki University Hospital and University of Helsinki, P. O. Box 340, 00029 HUS, Helsinki, Finland
2. Department of Anesthesiology, Intensive Care Medicine and Pain Medicine, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
3. Department of Bacteriology and Immunology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
4. Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
5. The Immunopharmacology Research Group, Faculty of Medicine and Life Sciences, University of Tampere and Tampere University Hospital, Tampere, Finland