[1] Cent South Univ, Xiangya Hosp, Ctr Stomatol, Dept Oral & Maxillofacial Surg, Changsha, Peoples R China
[2] Cent South Univ, Inst Oral Precancerous Les, Changsha, Peoples R China
[3] Cent South Univ, Xiangya Hosp, Res Ctr Oral & Maxillofacial Tumor, Changsha, Peoples R China
[4] Cent South Univ, Xiangya Hosp, Natl Clin Res Ctr Geriatr Disorders, Changsha, Peoples R China