1Department of Radiology, NYU School of Medicine, NYU Langone Medical Center, 660 1st Ave, Third Floor, New York, NY 10016
2Department of Radiology, Yale School of Medicine, New Haven, Conn
3Department of Radiology, Mayo Clinic, Rochester, Minn
4Department of Radiology, Duke University Medical Center, Duke Cancer Institute, Durham, NC
5Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD
6Departments of Radiology and Biomedical Imaging and Urology, University of California–San Francisco, San Francisco, Calif
7Department of Radiology, David Geffen School of Medicine at UCLA, Los Angeles, Calif