1. Department of Ophthalmology Erasmus MC Rotterdam The Netherlands
2. Department of Epidemiology Erasmus MC Rotterdam The Netherlands
3. The Rotterdam Eye Hospital Rotterdam The Netherlands
4. Department of Ophthalmology University of Groningen, University Medical Center Groningen Groningen The Netherlands
5. Department of Ophthalmology Muhibili University of Health and Allied Sciences Muhimbili National Hospital Dar es Salaam Tanzania
6. Department of Ophthalmology Comprehensive Community Based Rehabilitation in Tanzania (CCBRT) Hospital Dar es Salaam Tanzania
7. Division of Ophthalmology University of Cape Town Cape Town South Africa
8. Department of Ophthalmology Univerity Medical Center Utrecht, Utrecht, The Netherlands
9. Department of Ophthalmology University Medical Center Utrecht The Netherlands
10. Department of Ophthalmology Radboud University Medical Center Nijmegen The Netherlands
11. Institute of Molecular and Clinical Ophthalmology Basel Switzerland