title: How you ask really matters: randomised comparison of four sexual behaviour questionnaire delivery modes in Zimbabwean youth.
authors.affiliation: University College London, London, UK. lisa.langhaug@gmail.com
authors.forename: Lisa F
authors.initials: LF
authors.lastname: Langhaug
authors.forename: Yin Bun
authors.initials: YB
authors.lastname: Cheung
authors.forename: Sophie J S
authors.initials: SJ
authors.lastname: Pascoe
authors.forename: Petronella
authors.initials: P
authors.lastname: Chirawu
authors.forename: Godfrey
authors.initials: G
authors.lastname: Woelk
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Hayes
authors.forename: Frances M
authors.initials: FM
authors.lastname: Cowan