1. Department of Radiological Sciences, Oncology and Pathology, Sapienza University of Rome, Viale del Policlinico 155, 00161, Rome, Italy.
2. Department of Radiology, Radiolonet Tokai, Nagoya, Japan.
3. Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY.
4. Department of Medical Images, Radiation Therapy and Oncohematology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Brazil.