Maternal dietary patterns during pregnancy and preterm delivery: a large prospective cohort study in China oleh Min-Shan Lu, Jian-Rong He, Qiaozhu Chen, Jinhua Lu, Xueling Wei, Qianling Zhou, Fanfan Chan, Lifang Zhang, Niannian Chen, Lan Qiu, Mingyang Yuan, Kar Keung Cheng, Huimin Xia, Xiu Qiu, on behalf of the Born in Guangzhou Cohort Study Group