1. Department of Cardiology, Kerckhoff Heart and Thorax Center, Benekestr. 2-8, Bad Nauheim 61231, Germany
2. Department of Cardiology, University of Giessen and Marburg, Med. Klinik I, Germany
3. Department of Internal Medicine II, University of Ulm Medical Center, Albert-Einstein-Allee 23, Ulm 89081, Germany
4. Department of Cardiology, University Hospital Magdeburg, Leipziger Strasse 44, Magdeburg 39106, Germany
5. Department of Internal Medicine II, Evangelic Hospital Giessen, Paul-Zipp-Strasse 171, Giessen 35398, Germany
6. Faculty of Medical Biometry and Epidemiology, University of Hamburg-Eppendorf, Von-Melle-Park 5, Hamburg 20146, Germany
7. Department of Cardiology, St Elisabeth Hospital, Friedrich-Ebert-Strasse 59, Neuwied 56564, Germany