1. Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Department of Pediatric Dentistry, School of Stomatology, Tongji University, Shanghai 200072, P.R. China
2. Shanghai Ninth People's Hospital, Shanghai Jiaotong University, Shanghai 200011, P.R. China
3. Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200092, P.R. China
4. Department of Stomatology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China