The Influence of Morphologic Grading and COS Protocol on the Outcome of Day 5 Versus Day 6 Single Fresh Blastocyst Transfers: a Retrospective Analysis of Clinical Outcomes

Zhilan Chen Wuhan Kangjian Maternal and Infant Hospital https://orcid.org/0000-0002-6923-4273 Wei Li Wuhan Kangjian Maternal and Infant Hospital Cong Xiao Wuhan Kangjian Maternal and Infant Hospital Yanmin Li Wuhan Kangjian Maternal and Infant Hospital Liqun Lv Wuhan Kangjian Maternal and Infant Hospital Kecheng Huang Tongji Hospital Tongji medical college,Huazhong University of Science and Technology Aidong Gong (  360299731@qq.com ) Wuhan Kangjian Maternal and Infant Hospital

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