1. Department of Ophthalmology, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman
2. Department of Ophthalmology, Sheikh Fazilatunnesa Mujib Eye Hospital and Training Institute, Gopalgonj, Bangladesh
3. Department of Ophthalmology, Regional Institute of Ophthalmology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India