1. Max-Planck Institute for Biological Cybernetics; 72076 Tübingen Germany
2. Bernstein Center for Computational Neuroscience; Tübingen Germany
3. Institute for Ophthalmic Research; Centre for Ophthalmology; Tübingen Germany
4. Nuffield Laboratory of Ophthalmology; Department of Clinical Neurosciences; University of Oxford Oxford, UK
5. University Eye Clinic; University of Regensburg; Regensburg Germany
6. Division of Imaging Science and Biomedical Engineering; University of Manchester; Manchester UK
7. Department of Neuroscience and Neurology; Baylor College of Medicine; Houston TX USA