1. Department of Oral Pathology, Hospital of Stomatology Jilin University Changchun China
2. Key Laboratory of Tooth Development and Bone Remodeling of Jilin Province Changchun China
3. Department of Oral Pathology, School and Hospital of Stomatology China Medical University Shenyang China
4. Department of Biologic and Materials Sciences, School of Dentistry University of Michigan Ann Arbor Michigan USA