1. Department of Stomatology, China-Japan Union Hospital of Jilin University, Changchun, China.
2. Scientific Research Center, China-Japan Union Hospital, Jilin University, Changchun, China.
3. Tissue Bank, China-Japan Union Hospital of Jilin University, Changchun, China.
4. Department of Otolaryngology Head and Neck Surgery, First Clinical Hospital, Jilin University, Changchun, China.