By Steyn P.S.   Gebhardt G.S.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|87|2|167-168

Elsevier‎(1999)‎

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By Schneider D.J.   Steyn P.S.   Mansvelt E.P.G.   in European Journal of Obstetrics and Gynecology and Reproductive Biology

ISSN:0301-2115|91|2|197-198

Elsevier‎(2000)‎

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By Siebert I.   Steyn P. S.   in The European Journal of Contraception and Reproductive Health Care

ISSN:1473-0782|7|3|137-143

Informa Healthcare‎(2002)‎

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By Steyn P. S.   Odendaal H. J.   Schoeman J.   Stander C.   Fanie N.   Grové D.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|23|2|150-155

Informa Healthcare‎(2003)‎

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