Flowchart showing inclusion criteria for the samples of adolescents in this two-phase design study.
Chuanyou Yu, Wenming Xu, Zenguo Fu, Huijuan Mu(Shenyang Center for Disease Control and Prevention), Wen Pan, Jun Na(Shenyang Center for Disease Control and Prevention), Xiaoxia An, Jiang Chao, Ming Lv(Peking University), Lianzheng Yu(Shenyang Center for Disease Control and Prevention), Lili Li(Xuzhou Medical College), Ning Li, Liang Fang
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