1. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education; School and Hospital of Stomatology, Wuhan University; Wuhan 430079 China
2. Department of Oral Implantology; School and Hospital of Stomatology, Wuhan University; Wuhan 430079 China
3. Department of Oral and Maxillofacial Surgery; School and Hospital of Stomatology, Wuhan University; Wuhan 430079 China
4. Cell Therapy Institute, Centre for Collaborative Research; Nova Southeastern University, Fort Lauderdale; FL 33328 USA
5. Department of Periodontology, College of Dental Medicine; Nova Southeastern University, Fort Lauderdale; FL 33328 USA
6. Department of Periodontics and Oral Surgery; University of Ann Arbor, Ann Arbor; MI 48109 USA