1. Department of Oral and Maxillofacial‐Head Neck Oncology Shanghai Ninth People's Hospital College of Stomatology Shanghai Jiao Tong University School of Medicine Shanghai 200011 P. R. China
2. National Clinical Research Center for Oral Diseases Shanghai 200011 P. R. China
3. Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology Shanghai 200011 P. R. China
4. Research Unit of Oral and Maxillofacial Regenerative Medicine Chinese Academy of Medical Sciences Shanghai 200011 P. R. China
5. Department of Oral Pathology Ninth People's Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200011 P. R. China