: Research on reasons how vasectomy fails Commonly referred number is that in 1:1000 cases of vasectomy pregnancy can still happen (with same partner). How many such cases have been really studied so far where a pregnancy

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Research on reasons how vasectomy fails
Commonly referred number is that in 1:1000 cases of vasectomy pregnancy can still happen (with same partner).

How many such cases have been really studied so far where a pregnancy took place after vasectomy?
Alone in US these must be then about 500 cases annually.
www.webmd.com/men/features/vasectomy-risks-benefits
Now what are exactly reasons for that and can this be predicted through monitoring of these factors?

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