1. Division of Implant Dentistry; Department of Oral & Maxillofacial Surgery; Affiliated Stomatological Hospital of Medical School; Nanjing University; Nanjing China
2. Department of Periodontics; Affiliated Stomatological Hospital of Medical School; Nanjing University; Nanjing China
3. Department of Orthodontics; Affiliated Stomatological Hospital of Medical School; Nanjing University; Nanjing China
4. Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York; NY USA