1. Department of Medical Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research , Tokyo , Japan
2. Department of Chemotherapy and Cancer Center, The University of Tokyo Hospital , Tokyo , Japan
3. Department of Radiation Oncology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research , Tokyo , Japan
4. Department of Ophthalmology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research , Tokyo , Japan
5. Department of Head and Neck Surgery, Aichi Cancer Center Hospital , Nagoya , Japan
6. Department of Otolaryngology-Head and Neck Surgery, Hokkaido University Graduate School of Medicine , Sapporo , Japan