1. Department of Orthodontics, College of Stomatology, Hebei Medical University; The Key Laboratory of Stomatology, Hebei Province, Shijiazhuang, Hebei, P.R. of China
2. Department of Periodontology, University of Detroit Mercy, Detroit, MI, USA
3. Department of Stomatology, FengTai Hospital, Beijing, P.R. of China
4. Department of Oral and Maxillofacial Surgery, Hebei Medical University; The Key Laboratory of Stomatology, Hebei Province, Shijiazhuang, Hebei, P.R. of China
5. Department of Oral Pathology, College of Stomatology, Hebei Medical University; The Key Laboratory of Stomatology, Hebei Province, Shijiazhuang, Hebei, P.R. of China