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Miriam J. Temin, Friday E. Okonofua, Francesca O. Omorodion, Elisha P. Renne, Paul Coplan, H. Kris Heggenhougen, Joan Kaufman, Perceptions of Sexual Behavior and Knowledge About Sexually Transmitted Diseases Among Adolescents in Benin City, Nigeria, International Family Planning Perspectives, Vol. 25, No. 4 (Dec., 1999), pp. 186-190+195
Temin et al. (Wed,) studied this question.