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