title: The role of parents, friends and teachers in adolescents' cigarette smoking and tombak dipping in Sudan.
authors.affiliation: Tampere School of Public Health, 33014 University of Tampere, Tampere, Finland. salma.el.amin@uta.fi
authors.forename: Salma El-Tayeb
authors.initials: Sel-T
authors.lastname: El-Amin
authors.forename: Bright I
authors.initials: BI
authors.lastname: Nwaru
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Ginawi
authors.forename: Paola
authors.initials: P
authors.lastname: Pisani
authors.forename: Matti
authors.initials: M
authors.lastname: Hakama