1Division of Endocrinology and Metabolism, McMaster University, Hamilton, Canada
2Division of Endocrinology, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
3Fondazione Italiana sulla Ricerca sulle Malattie dell’Osso (FIRMO Foundation), Florence, Italy
4Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Mayo Clinic, Rochester, MN, USA
5Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA