1. Department of Ophthalmology & Vision Sciences, The Hospital for Sick Children, Toronto, Canada;
2. Child Health Evaluative Sciences Program, SickKids Research Institute, Toronto, Canada;
3. Department of Molecular Genetics, Faculty of Arts & Science, University of Toronto, Toronto, Canada;
4. Department of Human Biology Program, Faculty of Arts & Science, University of Toronto, Toronto, Canada;
5. Department of Ophthalmology, Beijing Children’s Hospital, Beijing, China;
6. Department of Ophthalmology, Capital Medical University, Beijing, China;
7. Department of Statistics, Faculty of Arts & Science, University of Toronto, Toronto, Canada;
8. Department of Psychiatry, The Hospital for Sick Children, Toronto, Canada;
9. Division of Clinical Public Health, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada;
10. Department of Ophthalmology & Vision Sciences, Faculty of Medicine, University of Toronto, Toronto, Canada;
11. Department of Human Pathology, College of Health Sciences, University of Nairobi, Nairobi, Kenya