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In page Martie Maguire:

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Erwin has been frank about using in vitro fertilization to conceive their daughters. In an interview in Conceive, she said, "All my paperwork said 'unspecified origin.' We spent three years of active trying before we went to IVF. First I went on Clomid. Then I had some dye tests and found I had a collapsed tube, so I had laparoscopic surgery; the tube wasn't blocked, just spasming." After three attempts at intrauterine insemination, she said, she and her husband didn't think it was worth continuing in that manner, and switched to IVF.[7] In August 2007, Maguire began IVF again, resulting in their third daughter Harper.