1. Department of Ophthalmology, Dr. Mohan's Diabetes Specialities Centre and Madras Diabetes Research Foundation, Chennai, India.
2. Department of Clinical Epidemiology, Madras Diabetes Research Foundation, Chennai, India.
3. Department of Diabetology, Dr. Mohan's Diabetes Specialities Centre and Madras Diabetes Research Foundation, Chennai, India.
4. Department of Data Management, Madras Diabetes Research Foundation, Chennai, India.
5. NIHR Moorfields Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom.