1. State Key Laboratory of Military Stomatology, Centre for Tissue Engineering; Fourth Military Medical University; Xi'an Shaanxi People's Republic of China
2. Department of Periodontology, School of Stomatology; Zunyi Medical Collage; Guizhou People's Republic of China
3. Research and Development Centre for Tissue Engineering; Fourth Military Medical University; Xi'an Shaanxi People's Republic of China
4. Department of Stomatology; First Affiliated Hospital, Guangzhou Medical University; Guangdong People's Republic of China
5. Department of Oral and Maxillofacial Surgery; General Hospital of Shenyang Military Area Command; Liaoning People's Republic of China