1 Department of Pediatric Ophthalmology, Strabismus and Neuro-ophthalmology, Aditya Birla Sankara Nethralaya, (A Unit of Medical Research Foundation, Chennai), Kolkata, West Bengal, India.
2 Orbit, Oculoplasty, Reconstructive & Aesthetic Services, Aditya Birla Sankara Nethralaya, Kolkata, India, (A Unit of Medical Research Foundation, Chennai, India).
3 Department of Radiodiagnosis, EKO X ray and Imaging Institute, 54, Jawahar Lal Nehru Road, Kolkata, West Bengal, India.