1. Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki and HUSLAB Helsinki University Central Hospital Laboratory, Helsinki
2. Department of Food and Environmental Hygiene, University of Helsinki, Helsinki
3. Department of Clinical Microbiology, University of Kuopio, Kuopio
4. Department of Clinical Microbiology, North Karelia Central Hospital, Joensuu
5. Department of Microbiology, University Central Hospital of Oulu, Oulu
6. Department of Medical Microbiology, University of Turku, Turku
7. Central Finland Central Hospital, Jyväskylä
8. Satakunta Central Hospital, Pori, Finland