1 Department of Oral and Maxillofacial Surgery, The Second Hospital of Hebei Medical University, Hebei, 050000 China.
2 Department of Medical Administration, The Second Hospital of Hebei Medical University, Hebei, 050000 China.
3 Department of Oral and Maxillofacial Surgery, The Second Hospital of Hebei Medical University, Hebei, 050000 China. Electronic address: yangweiywei68@126.com.