By Okonkwo J.E.N.   in Advances in Contraception

ISSN:0267-4874|15|1|61-68

Springer Publishing Company ‎(1999)‎

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By Okonkwo J.E.N.   Ibeh C.C.   in International Journal of Gynecology and Obstetrics

ISSN:0020-7292|83|3|325-326

Elsevier‎(2003)‎

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By Okonkwo J. E. N.   Udigwe G. O.   in Journal of Obstetrics & Gynaecology

ISSN:1364-6893|27|6|628-630

Informa Healthcare‎(2007)‎

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