1. Medical Research Foundation, Sankara Nethralaya, 18, College Road, Chennai 600006, India
2. Eye Institute, Cleveland Clinic Abu Dhabi (CCAD), Abu Dhabi P.O. Box 112412, United Arab Emirates
3. Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44195, USA
4. Department of Ophthalmology, Maastricht University Medical Center, 6211 LK Maastricht, The Netherlands