case-crossover study

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[Relationship between exposure to air pollutants during pre-pregnancy or early pregnancy and birth defects in Xi'an, 2013-2015: a case crossover study].
Zhang, Q;Xiang, X M;Song, H;Dong, M;Zhang, S P;Mi, B B;Wang, L L;Zhang, L;Yan, H;Dang, S N;
2017 zhonghua liu xing bing xue za zhi = zhonghua liuxi... DOI: 10.3760/cma.j.issn.0... 199 views

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air pollutants birth defects