1. Joslin Diabetes Center, Beetham Eye Institute, Boston, Massachusetts, USA.
2. Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA.
3. Department of Economics, Faculty of Arts and Sciences, American University of Beirut, Beirut, Lebanon.
4. Divison of Endocrinology and Metabolism, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon.
5. Department of Ophthalmology, American University of Beirut Medical Center, Beirut, Lebanon.