1. Zhanjiang Institute of Clinical Medicine, Central People's Hospital of Zhanjiang Guangdong Medical University Zhanjiang Central Hospital Zhanjiang P. R. China
2. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology Chinese Academy of Sciences Beijing China
3. Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology Xi'an Jiaotong University Xi'an P. R. China
4. Department of Posthodontics, College of Stomatology Xi'an Jiaotong University Xi'an P. R. China