1. Laser and Retina Research Unit, King's College Hospital, London, United Kingdom
2. Department of Epidemiology and Biostatistics, University of Athens, Athens, Greece
3. Laser and Retina Research Unit, King's College Hospital, London, United Kingdom 3National Institute for Health Research Moorfields Biomedical Research Centre, London, United Kingdom
4. Division of Diabetes and Nutritional Sciences, King's College London, United Kingdom
5. Institute of Psychiatry, Psychology and Neuroscience, King's College London, United Kingdom