1. Department of Oral and Maxillofacial Diseases, Clinicum University of Helsinki Helsinki Finland
2. Medical Research Centre Oulu University Hospital Oulu Finland
3. Department of Diagnostics and Oral Medicine, Medical Faculty, Research Group of Cancer Research and Translational Medicine University of Oulu Oulu Finland
4. Institute for Molecular Medicine Finland FIMM, Helsinki Institute of Life Science HiLIFE University of Helsinki Helsinki Finland
5. Department of Public Health University of Helsinki Helsinki Finland
6. Department of Mathematics and Statistics University of Helsinki Helsinki Finland
7. Department of Pathology University of Helsinki Helsinki Finland
8. Institute of Dentistry University of Misurata Misurata Libya