title: Impact of timing of sex education on teenage pregnancy in Nigeria: cross-sectional survey of secondary school students.
authors.affiliation: Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio Campus, PO Box 1627, 70211 Kuopio, Finland. ifeoma.ochiogu@uef.fi
authors.forename: Ifeoma N
authors.initials: IN
authors.lastname: Ochiogu
authors.forename: Juhani
authors.initials: J
authors.lastname: Miettola
authors.forename: Amobi L
authors.initials: AL
authors.lastname: Ilika
authors.forename: Tuula
authors.initials: T
authors.lastname: Vaskilampi