1. Strabismus, Pediatric Ophthalmology and Neuro-Ophthalmology Services, Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All Institute of Medical Sciences, New Delhi, India
2. Strabismus, Pediatric Ophthalmology and Neuro-Ophthalmology Services, Bhatia Netralaya, Bhilai, Chhattisgarh, India