1. Departments of Physiology and Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Universiteitssingel 50, ER Maastricht, The Netherlands
2. Heart Research Follow-Up Program, University of Rochester Medical Center, 265 Crittenden Blvd, Rochester, NY, USA
3. Department of Cardiology, Havelland Kliniken, Ketziner Straße 21, Nauen, Germany
4. Department of Cardiology and Angiology, Charité – Universitaetsmedizin Berlin, Charitéplatz 1, Berlin, Germany