- Correspondence to Prof Esteve Fernández, Cancer Epidemiology and Prevention (Tobacco Control Unit), Institut Catala d' Oncologia, 08907 L'Hospitalet de Llobregat, Catalunya, Spain;
- Received August 25, 2020
- Revised February 15, 2021
- Accepted February 23, 2021
- First published March 16, 2021.
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