1. Department of Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2. Research School of Behavioral and Cognitive Neurosciences, Graduate School of Medical Sciences, University of Groningen, Groningen, The Netherlands
3. Department of Ophthalmology, University Medical Center Utrecht, University of Utrecht, Utrecht, The Netherlands
4. W.J. Kolff Institute, Graduate School of Medical Sciences, University of Groningen, Groningen, The Netherlands