1. Department of Medicine III; University Hospital Dresden at the TU Dresden; Dresden Germany
2. Institute of Clinical Chemistry and Laboratory Medicine; University Hospital Dresden at the TU Dresden; Dresden Germany
3. Department of Endocrinology and Nephrology; University Hospital Leipzig; Leipzig Germany
4. Department of Hypertension; Institute of Cardiology; Warsaw Poland
5. Endocrine and Diabetes Unit; University Hospital Wurzburg; Wurzburg Germany
6. Endocrine Research Unit; Medical Clinic Innenstadt - LMU; Munich Germany
7. Department of Computing and Information Systems; University of Melbourne; Melbourne Vic. Australia
8. Department of Internal Medicine IV; University of Freiburg; Freiburg Germany
9. Department of Internal Medicine; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands