1. Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, P.R. China.
2. Department of Radiotherapy, Guangxi Medical University Cancer Hospital, Nanning, P.R. China.
3. Department of Radiotherapy, First Affiliated Hospital of Guangxi Medical University, Nanning, P.R. China.
4. Department of Pathology, Redcross Hospital of Yulin, Yulin, P.R. China.
5. Department of Pathology, Nanning Second People's Hospital, Third Affiliated Hospital of Guangxi Medical University, Nanning, P.R. China.
6. Department of Otolaryngology, Liuzhou People's Hospital, Liuzhou, P.R. China.