1. Institute of Public Health, Research Unit Health, Man and Society, University of Southern Denmark, Denmark
2. Institute of Public Health, Research Unit of Epidemiology, University of Southern Denmark, Denmark
3. University of Perugia, Department of Man and Environment, Perugia
4. San Giuseppe Hospital, Department of Oncology, Empoli
5. Careggi Hospital, Department of Oncology, Florence
6. Center for the Study and Prevention of Oncology, Florence, Italy