1. Department of Stomatology, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
2. Department of Neurology, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
3. Department of Stomatology, Jilin Province Hospital, Changchun, Jilin 130021, P.R. China
4. Department of Stomatology, 461 Outpatient Department, 208 Military Hospital, Changchun, Jilin 130021, P.R. China
5. Department of Endodontics, Bai‑He Stomatological Hospital, Changchun, Jilin 130041, P.R. China