1. Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University School of Medicine, Baltimore, MD
2. Division of Bone and Mineral Diseases, Washington University in St. Louis School of Medicine, St. Louis, MO
3. Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Germany and Center for Regenerative Therapies Dresden, Dresden, Germany
4. Division of Endocrinology, Diabetes, Metabolism, and Nutrition Research and the Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN
5. Departments of Orthopaedic Surgery and Physiology and Pharmacology and Center for Diabetes and Endocrine Research, The University of Toledo College of Medicine and Life Sciences, Toledo, OH
6. Department of Epidemiology & Biostatistics, University of California, San Francisco, San Francisco, CA