Male infertility can result from inadequate spermatozoa concentration or absence, and aberrant spermatozoa morphology and motility due to testicular failure (Klinefelters syndrome, chemotherapy, radiation therapy, undescended testicles, or varicoceleenlargement of the venous plexus in the scrotum), hormonal imbalances and use of anabolic steroids, detection of antisperm antibodies, sexually transmitted diseases, or ejaculatory obstructions, including cystic fibrosis (often presenting with bilateral absence of the vas deferens) (35, 36)
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[Google Scholar] Mangione CM, Barry MJ, Nicholson WK, Cabana M, et al