1. Department of Oral and Maxillofacial Surgery University of Groningen University Medical Center Groningen Groningen The Netherlands
2. Department of Pathology & Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
3. Department of Otorhinolaryngology/Head & Neck Surgery University of Groningen University Medical Center Groningen Groningen The Netherlands
4. Department of Epidemiology University of Groningen University Medical Center Groningen Groningen The Netherlands
5. Department of Research Comprehensive Cancer Organization The Netherlands (IKNL) Utrecht The Netherlands
6. Pathologie Friesland Leeuwarden The Netherlands
7. Department of Oral and Maxillofacial Surgery Medical Center Leeuwarden Leeuwarden The Netherlands
8. Department of Nuclear Medicine & Molecular Imaging University of Groningen University Medical Center Groningen Groningen The Netherlands