Relationship between pregnant women's combined exposure to heavy metals and their offspring's congenital heart defects in Lanzhou, China by Lulu Chen, Lulu Chen, Yaqin Zhao, Yaqin Zhao, Jianhao Sun, Jianhao Sun, Xinjuan Jiao, Zhenzhen Wu, Zhenzhen Wu, Jian Wang, Jie Qiu, Baohong Mao, Baohong Mao, Qing Liu, Qing Liu

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