1. OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven, Leuven, Belgium.
2. Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
3. Scientific Institute of Public Health, Department of Quality of Medical Laboratories, Brussels, Belgium.
4. Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden.