1. Department of Epidemiology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCSS), Milan, Italy;
2. Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy;
3. Department of Biomedical Sciences for Public Health, University of Milan, Milan, Italy;
4. Unit of Clinical Epidemiology, Galeazzi Orthopedic Institute, IRCCS, Milan, Italy;
5. Medical Oncology Unit, S. Maugeri Foundation, IRCCS, Pavia, Italy;
6. Unit of Biostatistics and Epidemiology, Department of Statistics, University of Milano-Bicocca, Milan, Italy;
7. Operative Unit of Territorial Health Service, Health Directorate, Regione Lombardia, Milan, Italy