1. Department of Ophthalmology, Erasmus MC, Rotterdam, The Netherlands 2Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
2. Division of Ophthalmology, University of Cape Town, Cape Town, South Africa
3. Department of Twin Research and Genetic Epidemiology, King's College London, London, United Kingdom 5Department of Ophthalmology, King's College London, London, United Kingdom
4. Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
5. Glaucoma Service, The Rotterdam Eye Hospital, Rotterdam, The Netherlands
6. Department of Ophthalmology, Erasmus MC, Rotterdam, The Netherlands 2Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands 7Department of Ophthalmology, Radboud University Medical Center, Nijmegen, The Netherlands