- Correspondence to Dr Jose M Martínez Sánchez, Unitat de Control del Tabaquisme, Institut Català d'Oncologia, Av Gran Via de L'Hospitalet 199-203, 08908 L'Hospitalet de Llobregat, Barcelona, Spain;
- Received November 6, 2012
- Accepted March 27, 2013
- First published April 25, 2013.
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