Reference ranges of fetal heart function using a Modified Myocardial Performance Index: a prospective multicentre, cross-sectional study by Xiaoming Zhang, Wei Zhao, Yuqing Zhou, Hong Lu, Jingjing Wang, Wei Guo, Wenjun Zhang, Sheng Zhao, Na Zhang, Lan Yu, Lijuan Sun, Yuxin Jiang, QingQing Wu, Zhen Li, Xiaoting Su, Xinlin Chen, Jianmei Niu, Congxin Sun, Jijing Han, Lina Zhang, Zhenna Wang, Peiwen Chen, Tiantian Chen, Hua Hong, Lulu Zhou, Baoying Ye, Jiawei Tian

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