1. From the Institute for Applied Computer Science and Automation, Karlsruhe Institute of Technology, Karlsruhe;
2. Department of Ophthalmology, University of Rostock, Rostock;
3. Institute for Applied Computer Science, Karlsruhe Institute of Technology, Karlsruhe, Germany.
4. From the Institute for Applied Computer Science and Automation, Karlsruhe Institute of Technology, Karlsruhe; 4Institute for Applied Computer Science, Karlsruhe Institute of Technology, Karlsruhe, Germany.