1. Department of Stomatology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
2. Chongqing Three Gorges Medical College, Chongqing 404120, P.R. China
3. Integrated Traditional and Western Medicine Research Center of The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong 510000, P.R. China