1. Department of Otolaryngology-Head and Neck Surgery; VU University Medical Center, Cancer Center Amsterdam; The Netherlands
2. Department of Epidemiology and Biostatistics; VU University Medical Center, Cancer Center Amsterdam; The Netherlands
3. Department of Pathology; VU University Medical Center, Cancer Center Amsterdam; The Netherlands
4. Department of Oral and Maxillofacial Surgery/Oral Pathology; VU University Medical Center/Academic Center for Dentistry Amsterdam (ACTA); The Netherlands