Department of Ophthalmology (ML, DK, RJWK), Antwerp University Hospital, Edegem, Belgium; Department of Ophthalmology (ML, DK, RJWK), Faculty of Medicine, Antwerp University Hospital, Antwerp University, Edegem, Belgium; and Department of Ophthalmology (RJWdK), Em. Prof. Leiden University Medical Centrum, Leiden, the Netherlands.