1 Department of Ophthalmology, University Hospitals Leuven, Leuven, Belgium;
2 Department of Ophthalmology, Centro Hospitalar São João, Porto, Portugal;
3 Department of Ophthalmology, Centro Hospitalar Lisboa Norte, Lisbon, Portugal; and the.
4 Department of Ophthalmology, University Hospitals Leuven, Leuven, Belgium; 4Department of Ophthalmology Neurosciences, Laboratory of Ophthalmology, KU Leuven, Leuven, Belgium.