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The flow chart of the cases enrolled in the study. There were 26,826 cases of oocyte retrieval conducted during January 2013 to December 2014. A total of 17,978 cases were first hyperstimulation IVF/ICSI cycles and enrolled. IVF/ICSI: In vitro fertilization or intracytoplasmic sperm injection; PGT: Preimplantation genetic testing.
