Prevalence and Treatment of Children's Asthma in Rural Areas Compared with Urban Areas in Beijing by Wen-Jing Zhu, Hai-Xia Ma, Hui-Ying Cui, Xu Lu, Ming-Jun Shao, Shuo Li, Yan-Qing Luo, Qiang Wang, Chun-Yu Xu, Dong-Qun Xu, Chuan-He Liu, Yu-Zhi Chen

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