1. University of Florida, Department of Radiology, Gainesville, Florida, United States
2. FDA, Office of Science and Engineering Laboratories (OSEL), Division of Imaging, Diagnostics and Software Reliability (DIDSR), Silver Spring, Maryland, United States
3. John Hopkins University School of Medicine, Radiological Physics Division, The Russell H. Morgan Department of Radiology and Radiological Science, Baltimore, Maryland, United States