Association between plasma growth differentiation factor 15 levels and pre‐eclampsia in China oleh Shuhong Xu, Yicheng Lu, Mengxin Yao, Zhuoqiao Yang, Yan Chen, Yaling Ding, Yue Xiao, Fei Liang, Jiani Qian, Jinchun Ma, Songliang Liu, Shilan Yan, Jieyun Yin, Qiuping Ma