- Correspondence to Dr Laura Costas, Unit of Infections and Cancer, Cancer Epidemiology Research Programme, Institut Català d'Oncologia, Av. Gran Via de l'Hospitalet 199-203, L'Hospitalet de Llobregat, Barcelona 08908, Spain;
- Received February 2, 2016
- Revised June 11, 2016
- Accepted July 20, 2016
- First published August 18, 2016.
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