1. Insitute of Clinical Medicine/Internal Medicine, University of Eastern Finland, Kuopio, Finland;
2. Department of Medicine, Kuopio University Hospital, Kuopio, Finland;
3. Siunsote - North Carelia Hospital District, Joensuu, Finland;
4. Department of Medicine, Kymenlaakso Central Hospital, Kotka, Finland;
5. Department of Clinical Microbiology, University of Eastern Finland, Kuopio, Finland;
6. Laboratory Centre of Eastern Finland, Kuopio, Kuopio, Finland