1. Department of Periodontics, School and Hospital of Stomatology, China Medical University, Shenyang, China
2. Center of Implant Dentistry School and Hospital of Stomatology, China Medical University, Shenyang, China
3. Department of Periodontics and Oral Biology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
4. Department of Oral Pathology, China Medical University School of Stomatology, Shenyang, China