1. Department of Medicine; Kuopio University Hospital; Kuopio Finland
2. Institute of Clinical Medicine/Internal Medicine; University of Eastern Finland; Kuopio Finland
3. Department of Internal Medicine; Tampere University Hospital; Tampere Finland
4. Siun Sote - Hospital District of North Carelia; Joensuu Finland
5. Eastern Finland Laboratory Centre; Kuopio Finland
6. Laboratory Division, Turku University Central Hospital and Department of Clinical Chemistry, Faculty of Medicine; University of Turku; Turku Finland