By Bahl R   Strachan BK   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|24|3|272-273

Informa Healthcare‎(2004)‎

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By van Wijngaarden W.J.   Strachan B.K.   Sahota D.S.   James D.K.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|88|1|43-48

Elsevier‎(2000)‎

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