1. Schüchtermann-Klinik Bad Rothenfelde, Bad Rothenfelde, Germany
2. Institute of Cardiology and Sports Medicine, German Sports University, Cologne, Germany
3. Reha-Zentrum Seehof der DRV-Bund, Teltow, Germany
4. MediClin Fachklinik Rhein/Ruhr, Essen, Germany
5. Kirchberg-Klinik, Bad Lauterberg, Germany