- Correspondence to Dr Esteve Fernández, Tobacco Control Unit, WHO Collaborating Centre for Tobacco Control, Institut Català d’Oncologia- ICO, 08908, L’Hospitalet de Llobregat, Barcelona, Spain;
- Received October 26, 2017
- Revised January 16, 2018
- Accepted January 25, 2018
- First published February 22, 2018.
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