1. Department of Oncology, Chengdu Fuxing Hospital, Chengdu, Sichuan 610037, P.R. China
2. Department of Head and Neck Oncology, West China Hospital of Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. Department of Research, Chengdu Fuxing Hospital, Chengdu, Sichuan 610037, P.R. China