Wiley, BJOG: An International Journal of Obstetrics and Gynaecology, 5(108), p. 543-544, 2001
DOI: 10.1111/j.1471-0528.2001.00106.x
British Journal of Obstetrics and Gynaecology, 5(108), p. 543-544
DOI: 10.1016/s0306-5456(00)00106-6
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