[1] Marriott Int, Bethesda, MD USA
[2] Johns Hopkins Univ, Sch Med, Dept Oncol, Russell H Morgan Dept Radiol & Radiol Sci, Baltimore, MD 21205 USA
[3] Johns Hopkins Univ, Sch Med, Dept Surg, Baltimore, MD 21205 USA
[4] Johns Hopkins Univ, Sch Med, Diagnost Imaging & Body CT, Baltimore, MD USA
[5] Johns Hopkins Univ, Sch Med, Russell H Morgan Dept Radiol & Radiol Sci, 600 N Wolfe St, Baltimore, MD 21287 USA