1. GRN Hospital Weinheim, Cardiology and Vascular Medicine, Weinheim, Germany
2. Department of Angiology, Sankt-Gertrauden-Krankenhaus, Berlin, Germany
3. Vascular Center Klinikum Arnsberg, Arnsberg, Germany
4. Practice for Vascular Medicine, Ettlingen, Germany
5. Department of Angiology, Municipal Hospital Dresden, Dresden, Germany
6. Essen, Nordrhein-Westfalen, Essen, Germany
7. Division of Vascular Medicine, Medical Clinic and Policlinic IV, University Hospital Munich, Munich, Germany
8. Institute of Biostatistics and Clinical Research, University of Muenster, Muenster, Germany
9. Department of Cardiology I - Coronary and Peripheral Vascular Disease, Heart Failure, University Hospital Muenster, Muenster, Germany