1. University of Ioannina,Unit of Medical Technology and Intelligent Information Systems, Dept. of Materials Science and Engineering,Ioannina,Greece
2. University of Athens, Hippocration Hospital,First Propaedeutic Dept. of Surgery, National and Kapodistrian,Athens,Greece
3. University of Ioannina, and with the Biomedical Research Institute FORTH, University Campus of Ioannina,Unit of Medical Technology and Intelligent Information Systems, Dept. of Materials Science and Engineering,Ioannina,Greece,45110