Trend on dental caries status and its risk indicators in children aged 12 years in China: a multilevel analysis based on the repeated national cross-sectional surveys in 2005 and 2... by Fei Li, Si-Cheng Wu, Zhi-Yuan Zhang, Edward Chin Man Lo, Wen-Jia Gu, Dan-Ying Tao, Xing Wang, Bao-Jun Tai, De-Yu Hu, Huan-Cai Lin, Bo Wang, Yan Si, Chun-Xiao Wang, Shu-Guo Zheng, Xue-Nan Liu, Wen-Sheng Rong, Wei-Jian Wang, Xi-Ping Feng, Hai-Xia Lu

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