1. Department of Ophthalmology; Center of Head and Orthopedics; Rigshospitalet; Glostrup Denmark
2. Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
3. Department of Ophthalmology; Naestved Sygehus; Naestved Denmark
4. Danish Center for Sleep Medicine, Clinical Neurophysiology; Center of Neurology; Rigshospitalet; Glostrup Denmark