1. Department of Medicine I, University Hospital Aachen, Aachen, Germany
2. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
3. Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
4. Asklepios Medical School Campus Hamburg, Semmelweis University, Hamburg, Germany
5. Aeromedical Center Lufthansa, Hamburg, Germany
6. Institute for Occupational and Maritime Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
7. Department of Biochjemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
8. Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center at the Heinrich-Heine-University Düsseldorf, Leibniz Center for Diabetes Research, Düsseldorf, Germany
9. Department of Psychosomatic Medicine and Psychotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
10. Department of Psychosomatic Medicine, Charite University Medical Center, Berlin, Germany
11. Diabetes Center Berlin Rose, Berlin, Germany
12. Department of Endocrinology, Diabetology and Rheeumatology, University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany