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To determine whether rescue intracytoplasmic sperm injection (ICSI) is associated with improved outcomes for non-male factor infertility. The changes of micro-structure, including meiotic spindle and chromosome distribution, sperm penetration, as well as oocyte activation were compared in IVF (in vitro fertilization) fertilization failure (IVF FF) patients, ICSI patients with non-fertilized oocytes...
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