Delayed second polar body extrusion increases abnormal cleavage risk and impairs embryonic developmental potential: a retrospective time-lapse study by Haifang Liu, Shikai Wang, Xianbao Mao, Jie Qin, Yongyi Pan, Zhengda Li, Xiaohui Zhang, Pingpin Wei, Liangshi Chen, Yueyue Huang, Wen Shi, Liling Liu, Lintao Xue

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