1. From the Departments of Public Health and
2. Ophthalmology, Erasmus Medical Center (MC), University Medical Center Rotterdam, Rotterdam, The Netherlands;
3. the TOV Foundation (Stichting TOV), Amsterdam, The Netherlands;
4. the Rotterdam Public Health Service (GGD Rotterdam-Rijnmond), Rotterdam, The Netherlands;
5. the The Rotterdam Eye Hospital, Rotterdam, The Netherlands; and
6. From the Departments of Public Health and 6Maternal and Child Health Care Rotterdam, Rotterdam, The Netherlands.