1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases; Center for Tissue Engineering; School of Stomatology; Fourth Military Medical University; Xi'an Shaanxi 710032 China
2. Xi'an Institute of Tissue Engineering and Regenerative Medicine; Xi'an Shaanxi 710032 China
3. Research and Development Center for Tissue Engineering; Fourth Military Medical University; Xi'an Shaanxi 710032 China
4. Department of Periodontology; Stomatological Hospital; Zunyi Medical College; Zunyi Guizhou 563003 China
5. Department of Dermatology; Tangdu Hospital; Fourth Military Medical University; Xi'an Shaanxi 710069 China