1. University of Ioannina,Unit of Medical Technology and Intelligent Information Systems,Dept. of Materials Science and Engineering,Ioannina,Greece
2. National and Kapodistrian University of Athens, Hippocration Hospital,First Propaedeutic Dept. of Surgery,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