From the Department of Radiology, The Ohio State University, Columbus, OH.
Received for publication May 10, 2016; and accepted for publication, after revision, May 10, 2016.
Conflicts of interest and sources of funding: none declared.
Correspondence to: Michael F. Tweedle, PhD, Department of Radiology, The Ohio State University, Biomedical Research Tower Rm 710, 460 W, 12th Ave, Columbus, OH 43210. E-mail: firstname.lastname@example.org.