By Rai N.   Hay D. M.   Grout P.   Lindow S. W.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|19|4|424-424

Informa Healthcare‎(1999)‎

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By Swallow B. L.   Lindow S. W.   Masson E. A.   Hay D. M.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|22|5|481-485

Informa Healthcare‎(2002)‎

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