1. Department of Periodontology, Oral Center of PLA Changhai Hospital Affiliated to Naval Medical University Shanghai China
2. Key Medical Laboratory of PLA Shanghai China
3. Department of Stomatology Medical College and Hospital Affiliated to Dalian University Dalian China
4. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Periodontology, School of Stomatology Fourth Military Medical University Xi'an China