1. Department of Plastic and Reconstructive Surgery Oslo University Hospital Oslo Norway
2. Department of Ophthalmology Haukeland University Hospital Bergen Norway
3. Department of Twin Research & Genetic Epidemiology King's College London St Thomas' Hospital London UK
4. Department of Medical Biochemistry Oslo University Hospital Oslo Norway
5. Department of Ophthalmology and Epidemiology University Medical Center Groningen University of Groningen Groningen The Netherlands
6. Faculty of Medicine Institute of Clinical Medicine University of Oslo Oslo Norway
7. Department of Ophthalmology Vestfold Hospital Trust Tønsberg Norway
8. Schepens Eye Research Institute/Massachusetts Eye and Ear Department of Ophthalmology Harvard Medical School Boston Massachusetts USA
9. Department of Ophthalmology Sørlandet Hospital Arendal Arendal Norway
10. Department of Ophthalmology Stavanger University Hospital Oslo Norway
11. Department of Ophthalmology Vestre Viken Hospital Drammen Norway