1. Calcium Metabolism and Osteoporosis Program (A.A., G.E.-H.F.), Beirut, Lebanon 113-6044
2. Division of Endocrinology, Department of Diagnostic Radiology (N.K.), Beirut, Lebanon 113-6044
3. Department of Pathology and Laboratory Medicine (L.Z.), American University of Beirut-Medical Center, Beirut, Lebanon 113-6044
4. Division of Nephrology, Hypertension and Vascular Medicine (A.B.), Beirut, Lebanon 113-6044