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To analyze cases in which no sperm could be identified after thawing among cryopreserved samples of rare or very low concentrations of sperm.Retrospective, single-institution, cross-sectional.Male infertility clinic.We identified couples that underwent intracytoplasmic sperm injection (ICSI) with the use of either ejaculated or testicular cryopreserved-thawed sperm. Inclusion criteria were men with...
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