1. European Institute of Oncology, Milan, Italy
2. Ospedale San Camillo Forlanini, Rome, Italy
3. Fondazione Pascale, Naples, Italy
4. Fondazione Maugeri, Pavia, Italy
5. Centro per lo Studio e la Prevenzione Oncologica, Florence, Italy
6. European Institute of Oncology, Milan; and Ente Ospedaliero Ospedali Galliera, Genoa, Italy