By Calvert S.M.   Tuffnell D.J.   Haley J.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|64|2|179-184

Elsevier‎(1996)‎

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By Calvert S. M.   Calvert R. J.   Hjartardottir H.   Beck I.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|20|2|205-206

Informa Healthcare‎(2000)‎

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