Association between early prenatal exposure to ambient air pollution and birth defects: evidence from newborns in Xi’an, China

Lingling Wang, Xiaomei Xiang, Baibing Mi, Hui Song, Min Dong, Shuiping Zhang, Yuxue Bi, Yaling Zhao, Qiang Li, Qi Zhang, Li Zhang, Hong Yan, Duolao Wang, Shaonong Dang