[1
]
Department of Radiation Oncology, University of Groningen, University Medical Center
Groningen, The Netherlands.
[2
]
Department of Otorhinolaryngology-Head and Neck Surgery, VU University Medical Center
Amsterdam, The Netherlands.
[3
]
Department of Radiation Oncology, VU University Medical Center Amsterdam, The Netherlands.
[4
]
Department of Medical Oncology, University of Groningen, University Medical Center
Groningen, The Netherlands.
[5
]
Department of Otorhinolaryngology-Head and Neck Surgery, University of Groningen,
University Medical Center Groningen, The Netherlands.
[6
]
Department of Oral and Maxillofacial Surgery, University of Groningen, University
Medical Center Groningen, The Netherlands.
[7
]
Department of Radiation Oncology, University of Groningen, University Medical Center
Groningen, The Netherlands. Electronic address: j.a.langendijk@umcg.nl.