1. Population Health Unit Finnish Institute for Health and Welfare Helsinki Finland
2. Department of Ophthalmology Helsinki University Hospital Helsinki Finland
3. Department of Neuromedicine and Movement Science Norwegian University of Science and Technology (NTNU) Trondheim Norway
4. Department of Clinical and Molecular Medicine NTNU Trondheim Norway
5. PEDEGO Research Unit, MRC Oulu Oulu University Hospital and University of Oulu Oulu Finland
6. Population Health Unit Finnish Institute for Health and Welfare Oulu Finland
7. Department of Ophthalmology St. Olavs Hospital Trondheim University Hospital Trondheim Norway
8. Children's Hospital Helsinki University Hospital and University of Helsinki Helsinki Finland
9. Department of Rehabilitation Science and Health Technology Oslo Metropolitan University Oslo Norway
10. Children's Clinic St. Olavs Hospital Trondheim University Hospital Trondheim Norway
11. University of Helsinki Helsinki Finland