1. State Key Laboratory of Military Stomatology; Shaanxi Key Laboratory of Stomatology; Department of Periodontology; School of Stomatology; Fourth Military Medical University; Xi'an Shaanxi China
2. State Key Laboratory of Military Stomatology; Shaanxi Key Laboratory of Stomatology; Center for Tissue Engineering; School of Stomatology; Fourth Military Medical University; Xi'an Shaanxi China