1Endocrine Unit, Massachusetts General Hospital/Harvard Medical School, Boston, MA, USA
2Department of Medicine III, Universitätsklinikum Dresden, Dresden, Germany
3Center for Healthy Aging, Universitätsklinikum Dresden, Dresden, Germany
4Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Mayo Clinic, Rochester, MN, USA
5Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
6Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA, USA
7Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA