1. Department of Dentomaxillofacial Radiology, Nanjing Stomatological HospitalMedical School of Nanjing UniversityNanjingChina
2. Department of Periodontology, Nanjing Stomatological HospitalMedical School of Nanjing UniversityNanjingChina
3. Department of StomatologyThird People's Hospital of Danyang CityDanyangChina
4. Nantong Stomatological HospitalNantongChina