1. Department of Head and Neck Surgery, Fudan University Shanghai Cancer Center, Shanghai, People's Republic of China.
2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China.
3. Department of Pathology, Fudan University Shanghai Cancer Center, Shanghai, People's Republic of China.
4. Department of General Surgery, Fudan University Zhongshan Hospital, Shanghai, People's Republic of China.