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Comparison of pregnancy and implantation rates according to spermatozoa source. Embryos generated from epididymal spermatozoa had the highest pregnancy rate followed by testicular and ejaculated spermatozoa (χ2, 2 × 3, 2df; P < 0.0001). Embryo implantation rate was highest with epididymal, followed by testicular and ejaculated specimen (χ2, 2 × 3, 2 df; P < 0.0001).
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