1. Department of Oral Medicine, Beijing Stomatological Hospital, Capital Medical University, Beijing, China
2. Cancer Research Program, Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, North Carolina, USA
3. Department of Pathology, Beijing Stomatological Hospital, Capital Medical University, Beijing, China
4. Beijing Institute of Dental Research, School of Stomatology, Capital Medical University, Beijing, China
5. Division of Medical Oncology, Department of Internal Medicine, The Ohio State University, Columbus, Ohio, USA