1. Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain
2. Unit of Infections and Cancer (UNIC), Cancer Epidemiology Research Programme, Institut Catala d'Oncologia - Catalan Institute of Oncology, IDIBELL, 08908 L'Hospitalet de Llobregat, Barcelona, Spain
3. CIBER Epidemiología y Salud Pública (CIBERESP), 08036 Barcelona, Spain
4. Hematology Department, Institut Catala d'Oncologia - Catalan Institute of Oncology, , IDIBELL, 08908 L'Hospitalet de Llobregat, Barcelona, Spain
5. Hospital Clinic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Universitat de Barcelona, 08036 Barcelona, Spain
6. Instituto Universitario de Oncología, University of Oviedo, 33006 Oviedo, Spain
7. Department of Preventive Medicine and Public Health, University of Granada, 18071 Granada, Spain
8. Instituto de Investigación Biosanitaria de Granada, Servicio Andaluz de Salud/Universidad de Granada, 18012 Granada, Spain
9. IMIM (Hospital del Mar Research Institute), 08003 Barcelona, Spain
10. Centre for Research in Environmental Epidemiology (CREAL), 08003 Barcelona, Spain
11. Facultad de Medicina, Universidad de Cantabria - IDIVAL, 39011 Santander, Spain
12. Infections and Cancer Epidemiology, Infection and Cancer Program, German Cancer Research Center (DKFZ), , 69121 Heidelberg, Germany
13. Department of Genome Modifications and Carcinogenesis, Infection and Cancer Program, German Cancer Research Center (DKFZ), 69121 Heidelberg, Germany
14. Environmental and Cancer Epidemiology Unit, National Center of Epidemiology, Instituto de Salud Carlos III, 28029 Madrid, Spain
15. IIS Puerta de Hierro, 28222 Majadahonda, Spain
16. National School of Public Health, Athens AL 35611, Greece