1. Department of Ophthalmology, Oslo University Hospital, Oslo, Norway
2. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
3. National Centre for Optics, Vision and Eye Care, Faculty of Health and Social Sciences, University of South-Eastern Norway, Kongsberg, Norway
4. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway
5. Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
6. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
7. Department of Ophthalmology, Stavanger University Hospital, Stavanger, Norway
8. Department of Clinical Medicine, Faculty of Medicine, University of Bergen, Bergen, Norway
9. Department of Ophthalmology, Sørlandet Hospital, Arendal, Norway