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File under “things you did not expect to learn about today” — Between 2002 and 2010, an estimated 17 616 patients presented to US EDs with trouser zip injuries to the genitals. The penis was almost always the only genital organ involved. Zip injuries represented nearly one-fifth of all penile injuries. 

Zip-related genital injury. [BJU Int. 2013] — PubMed — NCBI

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