Oocytes with a dark zona pellucida demonstrate lower fertilization, implantation and clinical pregnancy rates in IVF/ICSI cycles. por Wei Shi, Bo Xu, Li-Min Wu, Ren-Tao Jin, Hong-Bing Luan, Li-Hua Luo, Qing Zhu, Lars Johansson, Yu-Sheng Liu, Xian-Hong Tong

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