1. Department of Radiology, Federal University of São Paulo, SP, 04021-001, Brazil; Diagnósticos da America SA (Dasa), 05425-020, Brazil
2. School of Medicine, Federal University of Paraná, Curitiba, PR, 80060-000, Brazil
3. School of Medicine, State University of Centro-Oeste, Guarapuava, PR, 85040-167, Brazil
4. Department of Medicine, Division of Medical Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
5. Department of Oncology, Division of Radiation Oncology, Queen's University, Kingston, ON, K7L 3N6, Canada