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Vitamin D Level vs Semen Parameters
* Infertility is defined as the inability of a sexually active couple to conceive after 1 year of regular intercourse without contraception, affects approximately 15% of couples, and male factors are the cause in 20% -50% of cases. * Infertility of unknown origin is classified into idiopathic male infertility and unexplained male infertility according to semen quality.
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