1. Centre of Radiotherapy , National Institute of Oncology , Budapest , Hungary
2. Department of Oncology , Semmelweis University , Budapest , Hungary
3. National Tumour Biology Laboratory , National Institute of Oncology , Budapest , Hungary
4. Eötvös Loránd University , Faculty of Science , Budapest , Hungary
5. Department of Oral Radiology , Osaka Dental University , Osaka , Japan
6. Department of Oral Diagnostics , Semmelweis University , Budapest , Hungary