1. From the Department of Twin Research and Genetic Epidemiology, King's College London, St. Thomas' Hospital, London, United Kingdom;
2. the Departments of Ophthalmology and 3Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands;
3. Genetics and Population Health, Queensland Institute of Medical Research, Brisbane, Australia;
4. Centre for Eye Research Australia, University of Melbourne, Royal Victorian Eye and Ear Hospital, Melbourne, Australia;
5. Ulverscroft Vision Research Group, 7Medical Research Council Centre of Epidemiology for Child Health, Institute of Child Health,
6. the Center for Human Genetics, Duke University, Durham, North Carolina;
7. and Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands;
8. Medical Research Council Centre of Epidemiology for Child Health, Institute of Child Health, and the 9Institute of Ophthalmology, University College London, London, United Kingdom;
9. and the Lions Eye Institute, University of Western Australia, Centre for Ophthalmology and Visual Science, Perth, Australia.