1. Academic Practice of University of Leipzig, Leipzig, Germany.
2. Medtronic GmbH, Karl-Liebknecht-Str. 1, D-01796 Pirna, Germany.
3. Marienkrankenhaus Soest gGmbH Widumgasse 5 59494 Soest, Germany.
4. University Institute for Preventative and Rehabilitative Sports Medicine, Private Medical University, Lindhofstraße 20, A-5020, Salzburg, Austria.
5. August-Bebel-Str.71, 04275 Leipzig, Germany.
6. Herzzentrum Leipzig, Strümpellstraße 39, D-04289 Leipzig, Germany.