The association of maternal vaginal bleeding and progesterone supplementation in early pregnancy with offspring outcomes: a prospective cohort study by Chunrong Zhong, Guoping Xiong, Lixia Lin, Qian Li, Xi Chen, Xu Zhang, Yu Zhang, Shangzhi Xu, Xiaoyi Wang, Duan Gao, Meng Wu, Sen Yang, Weizhen Han, Guoqiang Sun, Xuefeng Yang, Liping Hao, Zhichun Jin, Nianhong Yang

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