1. Department of Internal Medicine II — Cardiology, University of Ulm Medical Center, Ulm, Germany,
2. Department of Epidemiology, German Center for Research on Ageing, Heidelberg, Germany,
3. Institute of Medical and Chemical Laboratory Diagnostics, University of Graz, Graz, Austria,
4. Institute of Clinical Chemistry and Laboratory Medicine, University of Greifswald, Greifswald, Germany and
5. Division of Clinical Chemistry, Department of Medicine, University of Freiburg, Freiburg, Germany.