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Practical Statistics for Medical Research.

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J Martin Bland, Douglas G. Altman · BMJ · 1996 · 637 citations · Full text

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Defective haemochorial placentation as a cause of miscarriage; a preliminary study

T. Yee Khong, H. S. LIDDELL, W.B. Robertson · BJOG An International Journal of Obstetrics & Gynaecology · 1987 · 218 citations

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Transvaginal Color Doppler Assessment of the Uteroplacental Circulation in Early Pregnancy

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