1. Department of Pharmacology and Toxicology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
2. Clinical Pharmacy Department, School of Pharmacy, Cairo University, Cairo, Egypt
3. Department of Ophthalmology, Harvey & Bernice Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, AR, USA
4. Division of Epidemiology & Clinical Applications, National Eye Institute, Bethesda, Maryland, USA