1. Cardiology Department, University Medical Centre Mainz , Langenbeckstrasse 1, 55131 Mainz , Germany
2. Centre for Cardiovascular Diseases, University Hospital Brussels , Laarbeeklaan 101, 1090 Jette , Belgium
3. Faculty of Medicine & Pharmacy, Vrije Universiteit Brussel , Laarbeeklaan 103, 1090 Jette , Belgium