By Nabi A   Awonuga A   Birch H   Barlow S   Stewart B   in Human Reproduction

ISSN:1460-2350|12|6|1188-1190

Oxford University Press‎(1997)‎

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By Miles C.A.   Fursey G.A.J.   Birch H.L.   Young R.D.   in Ultrasound in Medicine and Biology

ISSN:0301-5629|22|7|907-915

Elsevier‎(1996)‎

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