1. Department of Endodontics, Guiyang Hospital of Stomatology, Guiyang, China.
2. Department of Periodontics, Guiyang Hospital of Stomatology, Guiyang, China.
3. GuiZhou University Medical College, Guiyang, China.
4. Key Laboratory of Oral Disease Research, School of Stomatology, Zunyi Medical University, Zunyi, China.