1. Department of Oral Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
2. Department of Oral Pathology, College of Stomatology, Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
3. Department of Oral and Maxillofacial Surgery, College of Stomatology, Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
4. Physical Examination Center, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)