1 Computational Biomedicine Laboratory, Foundation for Research and Technology-Hellas (FORTH), Heraklion, Greece. Electronic address: kondylak@ics.forth.gr.
2 Computational Biomedicine Laboratory, Foundation for Research and Technology-Hellas (FORTH), Heraklion, Greece. Electronic address: koumakis@ics.forth.gr.
3 Biomedical Informatics and eHealth Lab, Department of Informatics Engineering, TEI Crete, Heraklion, Greece. Electronic address: tsiknakis@ics.forth.gr.
4 Institute for Biomedical Engineering, Fraunhofer Institute for Biomedical Engineering, St. Ingbert, Germany. Electronic address: Stephan.Kiefer@ibmt.fraunhofer.de.