1. Department of Ophthalmology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium; Faculty of Medicine, Antwerp University, Universiteitsplein 1, B-2610 Wilrijk, Belgium
2. Department of Ophthalmology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium; Faculty of Medicine, Antwerp University, Universiteitsplein 1, B-2610 Wilrijk, Belgium, Em. Prof., Department of Ophthalmology (Emeritus), Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, Netherlands