1. University of Chicago, Department of Radiology, 5841 S. Maryland Avenue, Chicago 60637, Illinois, United States
2. University of California at Davis, Department of Radiology, 4860 Y Street, Suite 3100, Sacramento 95817, California, United States
3. University of Oklahoma Health Sciences Center, Department of Radiological Sciences, 940 N.E. 13th Street, Oklahoma City 73104, Oklahoma, United States