1. Medical Faculty, University of Regensburg, 93053 Regensburg, Germany
2. First Medical Faculty, Charles University Prague, 12800 Prague, Czech Republic
3. Department of Informatics, Bioengineering, Robotics and System Engineering, University of Genoa, 16145 Genoa, Italy
4. Faculty European Campus Rottal-Inn, Deggendorf Institute of Technology, 94469 Deggendorf, Germany