1. Beetham Eye Institute, Joslin Diabetes Center, Boston, Massachusetts, United States 2Department of Ophthalmology, Medical University Vienna, Vienna, Austria
2. Beetham Eye Institute, Joslin Diabetes Center, Boston, Massachusetts, United States
3. Beetham Eye Institute, Joslin Diabetes Center, Boston, Massachusetts, United States 3Department of Histology and Cell Biology, Faculty of Medicine, Assiut University, Assiut, Egypt
4. Beetham Eye Institute, Joslin Diabetes Center, Boston, Massachusetts, United States 4Department of Ophthalmology, Cairo University, Cairo, Egypt
5. School of Optometry, Indiana University, Bloomington, Indiana, United States
6. Beetham Eye Institute, Joslin Diabetes Center, Boston, Massachusetts, United States 6Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States