Volume criteria for the treatment of head and neck cancer: Are they evidence based?

Department of Head and Neck Oncology and Surgery, The Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital Amsterdam, Amsterdam, The Netherlands, Department of Surgical Oncology, The Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital Amsterdam, Amsterdam, The Netherlands, Department of Oral and Maxillofacial Surgery, Academic Medical Hospital, Amsterdam, The Netherlands, Department of Phonetic Sciences, University of Amsterdam, Amsterdam, The Netherlands.