1. Department of Medical Oncology, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, Tokyo, Japan
2. Department of Medical Oncology & Hematology/Cancer Center, Kobe University Hospital, Kobe, Japan
3. Department of Head & Neck Oncology, Miyagi Cancer Center, Miyagi, Japan
4. Department of Head & Neck Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, Tokyo, Japan
5. Department of Head & Neck Medical Oncology, National Cancer Center Hospital East, Kashiwa, Japan
6. Eisai Co. Ltd, Tokyo, Japan
7. Eisai Inc., Woodcliff Lake, NJ 07677, USA