1. Department of Internal Medicine, Calcium Metabolism and Osteoporosis Program; American University of Beirut; Beirut Lebanon
2. Department of Endocrinology and Laboratory Medicine; Katholieke Universiteit Leuven; Leuven Belgium
3. Division of Endocrinology, Diabetes, Metabolism, and Nutrition; Mayo Clinic Foundation; Rochester MN USA
4. MRC Lifecourse Epidemiology Unit; University of Southampton; Southampton UK
5. Oregon Osteoporosis Center; Portland OR USA