Development and validation of an ultrasound-based estimated fetal weight reference for Chinese twin pregnancy: a retrospective cohort study by Jing Yang, Hongzhao Yu, Yangyu Zhao, Zhihao Cheng, Yufeng Du, Pengbo Yuan, Aiqing Zhang, Yang Liu, Xiaoli Gong, Yang Yu, Yixin Li, Xiaoyan You, Nana Huang, Youzhen Zhang, Xiya Sun, Hongbo Qi, Hong-tian Li, Yuan Wei

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