- Correspondence to Dr Esteve Fernández, Tobacco Control Research Unit, Institut Català d'Oncologia, Av. Gran Via de l'Hospitalet, 199-203, 08908 L'Hospitalet de Llobregat, Barcelona, Spain;
- Received May 3, 2011
- Accepted August 24, 2011
- First published September 28, 2011.
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