1. Department of Ophthalmology, Vinayaka Missions Medical College and Hospital, Vinayaka Missions Research Foundation (Deemed to be University), Karaikal, Puducherry, India
2. Department of Thoracic Medicine, Government Thoothukudi Medical College, Tuticorin, Tamil Nadu, India
3. Department of Ophthalmology, Aravind Eye Hospital and Post Graduate Institute of Ophthalmology, Madurai, Tamil Nadu, India