1. Hui Liu:
Department of Dental, North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, China
2. Ran Wu:
Department of Dental, North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, China
3. Lei Bi:
Department of Dental, North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, China
4. Xiaoliang Xu:
Tangshan Second Hospital, Tangshan, Hebei, China
5. Hui Chen:
Department of Dental, North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, China