Department of Ophthalmology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands. Department of Ophthalmology, Amsterdam University Medical Center, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands. Department of Ophthalmology, University Medical Center Groningen and W. J. Kolff Institute, Graduate School of Medical Sciences, University of Groningen, Groningen, The Netherlands. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands. Department of Ophthalmology, Queens University Belfast, Belfast, United Kingdom. Department of Ophthalmology, Radboud University Medical Center, Nijmegen, The Netherlands. Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands. Department of Ophthalmology, Erasmus University Medical Center, Rotterdam, The Netherlands. Department of Ophthalmology, Elisabeth-TweeSteden (ETZ) Hospital, Tilburg, The Netherlands. Department of Ophthalmology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands; Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Lausanne, Switzerland. Electronic address: r.o.schlingemann@amsterdamumc.nl.