1. Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam, and VU University Amsterdam, Department of Periodontology, The Netherlands
2. Foundation for Research and Technology – Hellas (FORTH), Institute of Computer Science, Bioinformatics Laboratory, Science and Technology Park of Crete, Heraklion 71110, Greece
3. Technical University of Crete, Department of Production Engineering and Management, Chania, Greece