1. Department of Ambulatory Care; Institut Gustave-Roussy; Villejuif France
2. Biostatistics and Epidemiology Unit; Institut Gustave-Roussy; Villejuif France
3. Department of Cancer Medicine; Institut Gustave-Roussy; Villejuif France
4. Department of Radiology; Oncology; and Human Pathology; “Sapienza” University of Rome; Rome Italy
5. Department of Oncology; University of Alberta; Edmonton Alberta Canada