1. Research Scholar, Mayo Clinic, Rochester, MN, USA
2. Faculty of Medicine, Tanta University Hospitals, Tanta, Egypt
3. Faculty of medicine, South Valley University, Qena, Egypt
4. Faculty of medicine, Beni-Suef University, Beni-Suef, Egypt
5. Clinical Research Scholar, Harvard Medical School, Boston, MA, USA
6. Master of Science in Clinical Investigations (MMSCI), Harvard Medical School, Boston, MA, USA
7. Research Fellow, Doheny Eye Institute, University of California, Los Angeles, CA, USA