1. Department of Stomatology, Zhujiang Hospital Southern Medical University Guangzhou China
2. Department of Oral and Maxillofacial Surgery Red Cross Hospital Kassel Germany
3. Key laboratory of Oral Medicine, Guangzhou Institute of Oral Disease Stomatology Hospital of Guangzhou Medical University Guangzhou China
4. Department of Oral and Maxillofacial Surgery University Hospital of Schleswig‐Holstein Kiel Germany
5. Private Practice Köln Germany