1. Graduate School, Zhejiang University of Chinese Medicine , Hangzhou , Zhejiang, 310053 , China
2. Department of Stomatology, Lishui People’s Hospital , Liandu District , Lishui , Zhejiang, 323000 , China
3. Department of Stomatology, Lishui People’s Hospital , No. 15 Dazhong Street, Liandu District , Lishui , Zhejiang, 323000 , China