1. Ifocus Haugesund Norway
2. Institute of Oral Biology University of Oslo Oslo Norway
3. Department of Health Sciences Oslo Metropolitan University Oslo Norway
4. Department of Medical Biochemistry Oslo University Hospital Oslo Norway
5. Department of Ophthalmology Oslo University Hospital Oslo Norway
6. Department of Ophthalmology Stavanger University Hospital Stavanger Norway
7. Department of Ophthalmology Sørlandet Hospital Arendal Arendal Norway
8. Department of Ophthalmology Vestre Viken Hospital Trust Drammen Norway