1. Retina & Vitreous Service, Tabriz University of Medical Sciences, Tabriz, Iran
2. Department of Ophthalmology, University of Florida, College of Medicine, Gainesville, FL, USA
3. Retina & Vitreous Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
4. Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran