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Pregnancy of unknown location: a consensus statement of nomenclature, definitions, and outcome.
Barnhart K, van Mello NM, Bourne T, Kirk E, Van Calster B, Bottomley C, Chung K, Condous G, Goldstein S, Hajenius PJ, Mol BW, Molinaro T, O'Flynn O'Brien KL, Husicka R, Sammel M, Timmerman D. Barnhart K, et al. Fertil Steril. 2011 Mar 1;95(3):857-66. doi: 10.1016/j.fertnstert.2010.09.006. Epub 2010 Oct 14. Fertil Steril. 2011. PMID: 20947073 Free PMC article.