1. Grupo d’Oncogènesi i Antitumorals, lnstitut d’Investigacions Biomèdiques Sant Pau (IIB-Sant Pau), Barcelona, Spain
2. Infections and Cancer Unit, Cancer Epidemiology Research Programme, Catalan Institute of Oncology (ICO) and Bellvitge Institute of Biomedical Research (IDIBELL), Barcelona, Spain
3. Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomecidicina (CIBER-BBN), Barcelona, Spain
4. Department of Otorrinolaryngology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain