1. Department of Otorhinolaryngology and Head & Neck Surgery, Department of Oncology, Hôpital de Sion - CHCVs - RSV, Sion
2. Unit of Radiation Oncology, Department of Oncology, Hôpital de Sion - CHCVs - RSV, Sion
3. School of Biology and Medicine, University of Lausanne, Lausanne, Switzerland