1. Department of Ophthalmology University of Helsinki and Helsinki University Hospital Helsinki Finland
2. SILK Department of Ophthalmology Faculty of Medicine and Health Technology Tampere University Tampere Finland
3. Finnish Register of Visual Impairment Finnish Federation of the Visually Impaired Helsinki Finland
4. Finnish Institute for Health and Welfare Information Services Department Helsinki Finland
5. Academic Primary Health Care Centre Stockholm Sweden
6. Department of Molecular Medicine and Surgery Karolinska Institute Stockholm Sweden
7. Tays Eye Centre Tampere University Hospital Tampere Finland