1. Department of Internal Medicine I-Cardiology; Würzburg University; Germany
2. Department of Cardiology; Leopoldina Hospital; Schweinfurt Germany
3. Comprehensive Heart Failure Center Würzburg; Würzburg University; Germany
4. Heart Clinic Ulm; Ulm Germany
5. Cardiology Practice Frankfurt; Frankfurt Germany
6. Clinic for Internal Medicine and Cardiology Calw; Calw District Hospital; Germany