1 Department of Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway.
2 Faculty of Medicine, University of Oslo, Oslo, Norway.
3 Centrum voor Hart en Vaatziekten (CHVZ), Universitair Ziekenhuis Brussel, Vrij Universiteit van Brussel, Brussels, Belgium.
4 Department of Cardiology, University of Medicine and Pharmacy 'Carol Davila'-Euroecolab, Emergency Institute for Cardiovascular Diseases 'Prof. Dr. C. C. Iliescu', Bucharest, Romania.
5 Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria.