1. Fifth Medical Clinic, University Medical Center Mannheim, Mannheim, Germany
2. Division of Endocrinology, Department of Medicine IV, Ludwig-Maximilians University, Munich, Germany
3. Division of Endocrinology and Diabetes, Department of Medicine I, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
4. Department of Medicine I and Clinical Chemistry, University of Heidelberg, Heidelberg, Germany
5. Department of Dermatology and Allergology, Ludwig-Maximilians University, Munich, Germany