Elsevier, Year Book of Obstetrics, Gynecology, and Women's Health, (2007), p. 335-337
DOI: 10.1016/s1090-798x(08)70237-6
American Medical Association, Journal of the American Medical Association, 14(295), p. 1647
DOI: 10.1001/jama.295.14.1647
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