1. Department of Internal Medicine VI, Clinical Pharmacology and Pharmacoepidemiology University Hospital Heidelberg, Germany
2. Division of Clinical Chemistry, Department of Medicine, Albert-Ludwigs-University, Freiburg, Germany
3. Department of Internal Medicine VII, Sports Medicine, University Hospital Heidelberg, Heidelberg, Germany
4. National Heart and Lung Institute, Imperial College of Science, Technology and Medicine, and Hammersmith Hospital London, United Kingdom
5. Institute for Medical Biometrics and Informatics, University of Heidelberg, Heidelberg, Germany