Franklin Nwoke1, Andrew C Picel2. 1. Department of Radiology, University of California, San Diego, 200 W. Arbor Dr., San Diego, CA 92130-8756. 2. Department of Radiology, University of California, San Diego, 200 W. Arbor Dr., San Diego, CA 92130-8756. Electronic address: apicel@ucsd.edu.