1. Istituto Nazionale per la Cura e lo Studio dei Tumori, Milan; Varese Cancer Registry
2. Tuscany Cancer Registry, Italy
3. Latina Cancer Registry, Italy
4. Parma Cancer Registry, Italy
5. Romagna Cancer Registry, Italy
6. Modena Cancer Registry, Italy
7. Ragusa Cancer Registry, Italy
8. Modena Colorectal Cancer Registry, Italy
9. Genova Cancer Registry, Italy
10. Piedmont and Valle D'Aosta Cancer Registry, Italy