Maternal ambient air pollution exposure with spatial-temporal variations and preterm birth risk assessment during 2013-2017 in Zhejiang Province, China - Sun, Zhe; Yang, Liyang; Bai, Xiaoxia; Wei Du; Shen, Guofeng; Fei, Jie; Wang, Yonghui; Chen, An; Chen, Yuanchen; Zhao, Meirong (Environment International, 2019)