1. Department of Pediatric Ophthalmology, Dr Om Parkash Eye Institute, Amritsar, Punjab, India
2. Department of Pediatric Ophthalmology, Strabismus and Neuro-ophthalmology, Dr Shroff’s Charity Eye Hospital, Daryaganj, New Delhi, Delhi, India
3. Department of Biostatistics, Dr Shroff’s Charity Eye Hospital, Daryaganj, New Delhi, Delhi, India
4. Smith-Kettlewell Eye Research Institute, SEELAB, San Francisco, USA