1. Department of Ophthalmology, Antwerp University Hospital, Edegem, Belgium;
2. Department of Ophthalmology, Visual Optics and Visual Rehabilitation, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerpen, Belgium;
3. Department of Ophthalmology, University Hospital Brussels, Jette, Belgium; and
4. Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Jette, Belgium.