1. Department of Oral and Maxillofacial Surgery Center of Stomatology Xiangya Hospital Central South University Changsha China
2. Institute of Oral Precancerous Lesions Central South University Changsha China
3. Research Center of Oral and Maxillofacial Tumor Xiangya Hospital Central South University Changsha China
4. National Clinical Research Center for Geriatric Disorders Xiangya Hospital Central South University Changsha China