@article{szklo_2008,  title={Review of strategies to recruit smokers for smoking cessation: a population impact perspective},  volume={24},  ISSN={0102-311X},  url={https://doi.org/10.1590/S0102-311X2008001600013},  DOI={10.1590/S0102-311X2008001600013},  journal={Cadernos de Saúde Pública},  publisher={Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz},  author={Szklo, André Salem},  year={2008},  pages={s621–s634} }