Department of Oral and Maxillofacial Surgery, Medical University of Graz, Auenbruggerplatz 5, 8036 Graz, Austria; Computer Algorithms for Medicine Laboratory, Graz, Austria; BioTechMed-Graz, Mozartgasse 12/II, 8010 Graz, Austria; Department of Cranio-Maxillofacial Surgery, AZ Monica Hospital Antwerp and Antwerp University Hospital, Antwerp, Belgium. Electronic address: j.wallner@medunigraz.at.