1. State Key Laboratory of Military Stomatology, Centre for Tissue Engineering; School of Stomatology, the Fourth Military Medical University; Xi'an Shaanxi China
2. Research and Development Centre for Tissue Engineering; Fourth Military Medical University; Xi'an Shaanxi China
3. State Key Laboratory of Military Stomatology, Department of Oral Histology and Pathology; School of Stomatology, Fourth Military Medical University; Xi'an Shaanxi China