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Ryan GL, Moss V, Davis WA, Sparks AE, Dokras A, Van Voorhis BJ.Ryan GL, et al. Among authors: van voorhis bj.J Reprod Med. 2005 Dec;50(12):943-50.J Reprod Med. 2005.PMID: 16444896
Ryan GL, Sparks AE, Sipe CS, Syrop CH, Dokras A, Van Voorhis BJ.Ryan GL, et al. Among authors: van voorhis bj.Fertil Steril. 2007 Aug;88(2):354-60. doi: 10.1016/j.fertnstert.2007.03.001. Epub 2007 May 9.Fertil Steril. 2007.PMID: 17490657Clinical Trial.
Thomas MR, Sparks AE, Ryan GL, Van Voorhis BJ.Thomas MR, et al. Among authors: van voorhis bj.Fertil Steril. 2010 Jul;94(2):543-8. doi: 10.1016/j.fertnstert.2009.03.051. Epub 2009 May 5.Fertil Steril. 2010.PMID: 19409548Free article.