Cigarette smoking among adolescents. Estimated prevalence by a questionnaire and serum cotinine

1. Cabrera de León, A.
2. Almeida González, D.
3. Pérez Méndez, L.
4. Carrillo Fernández, L.
5. Cueto Serrano, M.
6. Real Valcárcel, E.
7. Borges Álamo, C.
8. Navarro Brito E, null