1. State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Head and Neck Oncology, West China Hospital of Stomatology, Sichuan University, Chengdu, P.R. China.
2. Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Hospital of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, Guangdong, P.R. China.