1. Department of Clinical Physiology and Nuclear Medicine, Tampere University Hospital, Tampere, Finland;
2. Heart Center, Tampere University Hospital, Tampere, Finland;
3. Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland;
4. Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland;
5. Department of Internal Medicine, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland;
6. South Karelia Central Hospital, Lappeenranta, Finland