1. National Centre for Optics, Vision and Eye Care, Faculty of Health and Social Sciences, University College of Southeast Norway, Kongsberg, Norway
2. Department of Ophthalmology, Oslo University Hospital, Oslo, Norway
3. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
4. Department of Ophthalmology, Drammen Hospital, Drammen, Norway
5. Department of Ophthalmology, University of Washington, Seattle, Washington, United States