1. Department of General Internal Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
2. Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland.
3. Service of Endocrinology, Diabetes and Metabolism, University Hospital of Lausanne, Lausanne, Switzerland.
4. Leiden University Medical Center, Department of Clinical Chemistry and Laboratory Medicine, Leiden, the Netherlands.
5. Departments of Medicine and Epidemiology and Biostatistics, University of California, San Francisco, California.
6. Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
7. Department of Clinical Research, University of Bern, Bern, Switzerland.