1. Faculty of Medicine, Tanta University, Tanta, Egypt
2. Medical Research Group of Egypt (MRGE), Negida Academy, Arlington, Massachusetts, USA
3. Faculty of Medicine, Cairo University, Cairo, Egypt
4. Faculty of Medicine, Mansoura University, Mansoura, Egypt
5. Faculty of Medicine, Alexandria University, Alexandria, Egypt
6. Faculty of Medicine, Kafr El-Sheikh University, Kafr el-Sheikh, Egypt
7. Department of Ophthalmology, Hamad Medical Corporation, Doha, Qatar