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.