1. Department of Pediatric Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
2. Department of Oral Medicine, Huaian Stomatological Hospital, Huai'an, Jiangsu 223300, P.R. China
3. Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai 200011, P.R. China