1. University Medical Imaging Toronto, Joint Department of Medical Imaging, University Health Network, University of Toronto, Toronto, ON, Canada
2. Department of Radiology, Le Bonheur Children's Hospital, University of Tennessee Health Science Center, Memphis, TN, USA
3. Department of Radiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
4. Department of Radiology, Palo Alto VA Medical Center, Palo Alto, CA
5. Department of Diagnostic Imaging, Universidade Federal de São Paulo, São Paulo, Brazil
6. Dasa, São Paulo, Brazil
7. Department of Radiology, Emory University School of Medicine, Georgia, U.S.A
8. Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD