1. Department of Head and Neck Oncology and Surgery; The Netherlands Cancer Institute; Amsterdam The Netherlands
2. Department of Maxillofacial Surgery; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands
3. Medical Library, Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
4. Dutch Cochrane Center; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands
5. Department of Otorhinolaryngology; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands
6. Department of Otorhinolaryngology-Audiology; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands
7. Department of Medical Oncology; The Netherlands Cancer Institute; Amsterdam The Netherlands
8. Department of Radiation Oncology; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands