1. Calcium Metabolism and Osteoporosis Program, WHO Collaborating Center for Metabolic Bone Disorders, Division of Endocrinology, American University of Beirut Medical Centre; Department of Internal Medicine; Riad El Solh Street Beirut Lebanon
2. American University of Beirut; Department of Internal Medicine; Riad El Solh Street Beirut Lebanon
3. American University of Beirut Medical Centre; Department of Internal Medicine, Calcium Metabolism and Osteoporosis Program, WHO Collaborating Center for Metabolic Bone Disorders, Division of Endocrinology; Riad El Solh Street PO Box 11-0236 Beirut Lebanon