Wiley, BJOG: An International Journal of Obstetrics and Gynaecology, 9(108), p. 967-972, 2001
DOI: 10.1111/j.1471-0528.2001.00221.x
British Journal of Obstetrics and Gynaecology, 9(108), p. 967-972
DOI: 10.1016/s0306-5456(01)00221-2
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