1. Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1473, Houston, TX 77030.
2. Department of Radiology, Mayo Clinic, Phoenix, AZ
3. Department of Radiology, The University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI
4. Department of Internal Medicine, Medstar Union Memorial Hospital, Baltimore, MD
5. Department of Diagnostic Radiology, University of Missouri-Columbia, Columbia, MO
6. Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, UT