From the Department of Radiology, Division of Nuclear Medicine, Keck School of Medicine University of Southern California, Los Angeles, CA.
Received for publication April 9, 2012; revision accepted May 30, 2012.
Conflicts of interest and sources of funding: none declared.
Reprints: Andrew Chae Kim, MD, Department of Radiology, University of Southern California, D+T Room 3D321, Los Angeles, CA 90033. E-mail: firstname.lastname@example.org.