1. Department of Ophthalmology; VU University Medical Center; Amsterdam the Netherlands
2. EMGO+ Institute for Health and Care Research; VU University Medical Center; Amsterdam the Netherlands
3. Department of Ophthalmology; Elkerliek Hospital; Helmond the Netherlands
4. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam the Netherlands
5. Department of Otorhinolaryngology; VU University Medical Center; Amsterdam the Netherlands