1. Endocrine UnitMassachusetts General Hospital/Harvard Medical School Boston MA USA
2. Department of Medicine IIIUniversitätsklinikum Dresden Dresden Germany
3. Center for Healthy AgingUniversitätsklinikum Dresden Dresden Germany
4. Division of Endocrinology, Diabetes, Metabolism, and NutritionMayo Clinic Rochester MN USA
5. Department of MedicineUniversity of California, San Francisco San Francisco CA USA
6. Department of Epidemiology and BiostatisticsUniversity of California, San Francisco San Francisco CA USA
7. Robert and Arlene Kogod Center on AgingMayo Clinic Rochester MN USA