1. Radiology Department; Hospital de Clínicas de Porto Alegre; Porto Alegre Brazil
2. Federal University of Rio Grande do Sul; Porto Alegre Brazil
3. Radiology Department; Federal University of Rio de Janeiro; Rio de Janeiro Brazil
4. Department of Radiology; Liverpool Heart and Chest Hospital; Liverpool United Kingdom
5. Department of Imaging; Hospital AC Camargo; São Paulo Brazil
6. Department of Diagnostic Radiology; The University of Texas MD Anderson Cancer Center; Houston TX USA
7. Medical Imaging Research Lab; Santa Casa de Porto Alegre/Federal University of Health Sciences of Porto Alegre; Porto Alegre Brazil