1. Department of Internal Medicine; Beirut Arab University; Beirut Lebanon
2. Department of Medicine, Division of Cardiovascular Medicine; Brigham and Women's Hospital, Harvard Medical School; Boston MA Massachusetts USA
3. Department of Internal Medicine; American University of Beirut Medical Center; Beirut Lebanon
4. Department of Internal Medicine, Calcium Metabolism and Osteoporosis Program, WHO Collaborating Center for Metabolic Bone Disorders, Division of Endocrinology; American University of Beirut Medical Centre; Beirut Lebanon