1. Department of Internal Medicine, Section Endocrinology and Metabolism, Leiden University Medical Center, Leiden, Netherlands
2. Endocrine Research Unit, Mayo School of Graduate Medical Education, Center for Translational Science Activities, Mayo Clinic, Rochester, Minnesota
3. Division of Endocrinology, Department of Medicine, David Geffen School of Medicine at University of California Los Angeles, Harbor-University of California Los Angeles Medical Center, and Los Angeles Biomedical Research Institute, Los Angeles, California
4. Department of Primary Care Internal Medicine, Mayo Clinic, Rochester, Minnesota