1. Shandong Provincial Key Laboratory of Oral Tissue Regeneration School of Stomatology Shandong University Jinan China
2. Department of Periodontology School of Stomatology Shandong University Jinan China
3. Department of Stomatology Weifang People’s Hospital Weifang China
4. Department of Periodontology Jinan Stomatological Hospital Jinan China
5. Department of Oral and Maxillofacial Surgery Qilu Hospital and Institute of Stomatology Shandong University Jinan China