1. MS-State Key Laboratory, School of Stomatology, Fourth Military Medical University, Xi’an, China.
2. Department of Pediatric Dentistry, School of Stomatology, Fourth Military Medical University, Xi’an, China.
3. Institute for Biomedical Sciences of Pain, Tangdu Hospital, Fourth Military Medical University, Xi’an, China.
4. Department of Anatomy and Cell Biology, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104, USA.