1. Department of Radiology, Duke University, 2301 Erwin Rd, Durham, NC 27710.
2. Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH.
3. American College of Radiology, Reston, VA.
4. Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA.
5. Department of Radiology, University of Bern, University Hospital, Bern, Switzerland.
6. University of Kentucky, Lexington, KY.