1. Department of Cardiology, Ostalb Clinic Aalen, Im Kaelblesrain 1, 73430 Aalen, Germany
2. Department of Cardiology, University Hospital Tuebingen, Otfried-Mueller-Straße 10, 72076 Tuebingen, Germany
3. Department of Cardiology, University Hospital Marburg, Philipps University Marburg, Baldingerstraße, 35043 Marburg, Germany