1. State Key Laboratory of Military Stomatology, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Department of Pediatric Dentistry School of Stomatology, Fourth Military Medical University Xi'an China
2. Department of Stomatology General Hospital of Tibetan Military Command Lhasa China
3. Department of Microbiology School of Basic Medicine, Fourth Military Medical University Xi'an China