1. Department of Pathology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
2. Department of Oral and Maxillofacial Surgery & Special Dental Care, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
3. Department of Head and Neck Surgical Oncology, Utrecht Cancer Center, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
4. Hubrecht Institute, Developmental Biology & Stem Cell Research, 3584 CT Utrecht, The Netherlands
5. Department of Pathology, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands