1. Section of Oral Diagnostics and Surgery, Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden
2. Department of Oral and Maxillofacial Surgery, VU University Medical Center, Amsterdam, The Netherlands
3. Medical Radiation Physics, Karolinska University Hospital, Huddinge, Sweden
4. Department of clinical dentistry, Faculty of Medicine, Section of Dentomaxillofacial radiology, University of Bergen, Bergen, Norway