1 Department of Oral Biology, Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, P.R. China.
2 Department of Endodontics, School and Hospital of Stomatology, Jilin University, Changchun, P.R. China.
3 Department of Pathology, School and Hospital of Stomatology, Jilin University, Changchun, P.R. China.
4 School and Hospital of Stomatology, China Medical University, Shenyang, P.R. China.
5 School and Hospital of Stomatology, China Medical University, Shenyang, P.R. China. bwh196@gmail.com.
6 School and Hospital of Stomatology, China Medical University, Shenyang, P.R. China. sunhongchen@cmu.edu.cn.