1. Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
2. Department of Epidemiology and Health Services Research, Centre for Primary Care and Public Health (Unisanté), University of Lausanne, Lausanne, Switzerland
3. Department of Medicine and Surgery, University of Parma, Parma
4. Department of Public Health, Experimental and Forensic Medicine, University of Pavia
5. Medical Direction, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
6. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, Maryland, USA
7. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy