1. Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
2. Department
of Oral and Maxillofacial Surgery, Central Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, China
3. Center
for Biomedical Materials and Tissue Engineering, Academy for Advanced
Interdisciplinary Studies, Peking University, Beijing 100871, China