1. Institute of Clinical Chemistry and Laboratory Medicine;
2. Department of Medicine III;
3. Institute for Medical Informatics and Biometry, University Hospital of Dresden, 01307 Dresden;
4. Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, 04103 Leipzig, Germany;
5. Department of Hypertension, Institute of Cardiology, 04-628 Warsaw, Poland;
6. Department of Laboratory Medicine;
7. Program in Reproductive and Adult Endocrinology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA;
8. Department of Internal Medicine, Radboud University Nijmegen Medical Center, 6525GA Nijmegen, The Netherlands