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