1. Unit of Medical Technology and Intelligent Systems, Research Institute-FORTH and School of Electrical and Computer Engineering, National Technical University of Athens,Dept. of Materials Science and Engineering and Biomedical,Ioannina,Greece
2. Unit of Medical Technology and Intelligent Systems, Research Institute-FORTH University of Ioannina,Dept. of Materials Science and Engineering and Biomedical,Ioannina,Greece
3. School of Electrical and Computer Engineering, National Technical University of Athens,Athens,Greece
4. University of Heidelberg,Medical Faculty Mannheim,Dept. of Medicine,Mannheim,Germany