1. Center for Ophthalmology, University of Tübingen, Tübingen, Germany
2. Praxis für Humangenetik Tübingen, Tübingen, Germany
3. Department of Human Genetics, Radboud University Medical Center and Donders Institute for Brain, Cognition and Behaviour, Nijmegen, the Netherlands
4. Werner Reichardt Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany