Cohort profile: the Chinese Pregnant Women Cohort Study and Offspring Follow-up (CPWCSaOF) oleh Xuan Liu, Guangliang Shan, Ping Huang, Yu Jiang, Yimin Qu, Jian Zhao, Tianchen Lyu, Yunli Chen, Yongle Zhan, Yingjie Shi, Hexin Yue, Yaohan Meng, Ao Jing, Haihui Ma, Dongmei Man, Xiaoxiu Li, Hongguo Wu