Affiliation: | 1. Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland Deceased;2. Department of Surgery, Helsinki University Hospital and University of Helsinki, Helsinki, Finland;3. Department of Gastroenterology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland;4. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland Health Sciences Unit, Faculty of Social Sciences, Tampere University, Tampere, Finland;5. Clinical Microbiology, Department of Medical Sciences, Uppsala University, Uppsala, Sweden |