The diameter of the proximal tube--large enough for a single sperm or do you need more?

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V Karande et al. Fertil Steril. 1999 Nov.

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. 1999 Nov;72(5):950-1.

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The limited value of hysterosalpingography in assessing tubal status and fertility potential.
Karande VC, Pratt DE, Rabin DS, Gleicher N. Karande VC, et al. Fertil Steril. 1995 Jun;63(6):1167-71. doi: 10.1016/s0015-0282(16)57591-8. Fertil Steril. 1995. PMID: 7750583
Pathophysiology and management of proximal tubal blockage.
Honoré GM, Holden AE, Schenken RS. Honoré GM, et al. Fertil Steril. 1999 May;71(5):785-95. doi: 10.1016/s0015-0282(99)00014-x. Fertil Steril. 1999. PMID: 10231034 Review.