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Patient selection process and flowchart of oocyte and subsequent embryo development. COC cumulus–oocyte–complex, MII oocyte metaphase II oocyte, ICSI intracytoplasmic sperm injection, TQ top quality, non-TQ non-top quality. aEmbryo grading details are presented in the “Materials and methods” section. bArrested development refers to embryos that failed to progress from day 3 to the blastocyst stage
