1. Heart and Lung Center (H.-K.N., P.P., J.L., K.E., M.N., M.K.), Helsinki University Hospital and University of Helsinki, Finland.
2. Radiology (P.P., V.U.), Helsinki University Hospital and University of Helsinki, Finland.
3. Clinical Physiology and Nuclear Medicine (V.U.), Helsinki University Hospital and University of Helsinki, Finland.
4. Heart Center, Turku University Hospital, Finland (T.V.).
5. Medical Research Center Oulu, University and University Hospital of Oulu, Finland (K.K.).
6. Heart Hospital, Tampere University Hospital, Finland (P.H.).
7. Department of Internal Medicine, Päijät-Häme Central Hospital, Lahti, Finland (T.K.).
8. Heart Center, North Karelia Central Hospital, Joensuu, Finland (T.T.R.).
9. South Ostrobothnia Central Hospital, Seinäjoki, Finland (A.A.).
10. Vaasa Central Hospital, Finland (P.P.-E.).