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Postvasectomy semen analysis: are men following up?
Christensen RE, Maples DC Jr. Christensen RE, et al. J Am Board Fam Pract. 2005 Jan-Feb;18(1):44-7. doi: 10.3122/jabfm.18.1.44. J Am Board Fam Pract. 2005. PMID: 15709063 Free article.