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Sperm retrieval for in vitro fertilization/intracytoplasmic sperm injection is the only medical procedure that enables a man with testicular azoospermia to father a child. In obstructive azoospermia after failed refertilization, microsurgical epididymal sperm aspiration is the gold standard, with retrieval rates up to 100%. In nonobstructive azoospermia (NOA), testicular spermatozoa (spermatids) can...
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