1. College of Stomatology Xinjiang Medical University Urumqi Xinjiang 830011 P. R. China
2. Department of Oral Maxillofacial Surgery Shenzhen Hospital Southern Medical University Shenzhen 518000 P. R. China
3. Research Center for Human Tissue and Organs Degeneration Institute of Biomedicine and Biotechnology Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China