1 Department of Internal Medicine, McLaren Health Care, Flint, Michigan, USA; Department of Internal Medicine, Michigan State University, East Lansing, Michigan, USA.
2 Faculty of Medicine, Alexandria University, Alexandria, Egypt.
3 Faculty of Medicine, Cairo University, Cairo, Egypt.
4 Ophthalmology Department, Faculty of Medicine, University of Ulm, Ulm, Germany; Experimental Ophthalmology, Charite Universitätsmedizin Berlin, Campus Virchow-Klinikum, Berlin, Germany. Electronic address: ahmad@alfaar.de.