1 Division of Endocrinology, Calcium Metabolism and Osteoporosis Program, WHO Collaborating Center for Metabolic Bone Disorder, American University of Beirut Medical Center, Beirut, Lebanon.
2 Division of Endocrinology, American University of Beirut, Beirut Lebanon.
3 Division of Pulmonary, Sleep and Critical Care Medicine, American University of Beirut, Beirut Lebanon.
4 Pulmonary Center, Boston University School of Medicine, Boston MA.