1. Department of Cardiology, Campus Virchow-Klinikum; Charité Universitätsmedizin Berlin; Berlin Germany
2. Department of Medicine III; University Hospital Halle (Saale), Martin-Luther-University Halle-Wittenberg; Halle Germany
3. Department of Cardiology; Diabetology and Endocrinology, Klinikum Magdeburg GmbH; Magdeburg Germany
4. Department of Cardiology; University Hospital Rostock; Ernst-Heydemann Street 6 Rostock 18057 Germany