1. Department of Otolaryngology/Head and Neck Surgery Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Center Amsterdam Amsterdam The Netherlands
2. Academic Center for Dentistry Amsterdam (ACTA) Amsterdam The Netherlands
3. Fanconi‐Anämie Hilfe e.V Unna‐Siddinghausen Germany
4. Children's Hospital Neuwerk Mönchengladbach Germany
5. Heinrich‐Heine‐University Düsseldorf Department for Cytopathology Düsseldorf Germany
6. Department of Oral and Maxillofacial Surgery and Oral Pathology, Amsterdam UMC, Vrije Universiteit Amsterdam Cancer Center Amsterdam Amsterdam The Netherlands
7. Department of Pathology, Amsterdam UMC, Vrije Universiteit Amsterdam Cancer Center Amsterdam Amsterdam The Netherlands