1 Research Unit of Internal Medicine, Medical Research Center, University Hospital of Oulu and University of Oulu, Finland. Electronic address: [email protected].
2 Dept. of Cardiology and Pneumology, Heart Center, University of Goettingen, Goettingen/Germany.
3 Cardiologia, IRCCS Ospedale Maggiore, Universita degli Studi di Milano, Italy.
4 National Heart and Lung Institute, Imperial College, London, England, United Kingdom.