Ramsey D. Badawi, PhD 
Department of Radiology, University of California Davis, 4860 Y Street, Suite 3100, Sacramento, CA 95817, USA
Joel S. Karp, PhD 
Department of Radiology, University of Pennsylvania, 3620 Hamilton Walk, John Morgan Building - Room #154, Philadelphia, PA 19104-6112, USA
Lorenzo Nardo, MD, PhD 
Department of Radiology, University of California Davis, 4860 Y Street, Suite 3100, Sacramento, CA 95817, USA
Austin R. Pantel, MD, MSTR 
Department of Radiology, University of Pennsylvania, 3400 Spruce Street, 1 Silverstein, Suite 130, Philadelphia, PA 19104, USA