By Kirwan J.M.J.   Herrington C.S.   in British Journal of Obstetrics and Gynaecology

ISSN:0306-5456|108|12|1204-1213

Elsevier‎(2001)‎

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By Kirwan J. M. J.   Farquharson R. G.   Cdicken I. M   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|18|5|494-495

Informa Healthcare‎(1998)‎

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