Open-Access License: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Address correspondence to this author at the Radiology Department, Dallas
VA Medical Center, 4500 South Lancaster Road, Dallas, TX 75216, USA;
Tel: 214-857-0185; Fax: 214-857-0173; E-mail: Pramod.Gupta@va.gov