1. I-BioStat, KU Leuven, Leuven, Belgium;
2. I-BioStat, Universiteit Hasselt, Hasselt, Belgium;
3. Ophthalmology Department, Centro Hospitalar São João, Porto, Portugal;
4. Surgery and Physiology Unit, Faculty of Medicine of the University of Porto, Porto, Portugal;
5. Research Group Ophthalmology, KU Leuven, Leuven, Belgium