1. Department of Cardiology and Angiology I, Medical Faculty, University of FreiburgUniversity Heart Center Freiburg Freiburg Germany
2. Faculty of Medicine and Medical Center – University of FreiburgInstitute of Medical Biometry and Statistics Freiburg Germany
3. Department of Cardiovascular Surgery, Medical Faculty, University of FreiburgUniversity Heart Center Freiburg Freiburg Germany
4. Department of CardiologyUniversity Hospital Graz Graz Austria