1. Department of Ophthalmology, Zealand University Hospital, Roskilde, Denmark
2. Department of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
3. Department of Ophthalmology, Rigshospitalet, Copenhagen, Denmark
4. Institute of Public Health, University of Copenhagen, Copenhagen, Denmark
5. Centre for Clinical Research and Disease Prevention, Capital Region, Denmark
6. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark