[1] Med Univ S Carolina, Dept Radiol & Radiol Sci, Charleston, SC 29425 USA
[2] Ludwig Maximilians Univ Hosp, Inst Clin Radiol, Munich, Germany
[3] Med Univ S Carolina, Dept Med, Div Cardiol, Charleston, SC 29425 USA
[4] Johns Hopkins Univ Hosp, Russell H Morgan Dept Radiol & Radiol Sci, Baltimore, MD 21287 USA
[5] Univ Roma La Sapienza, Dept Radiol Sci Oncol & Pathol, Latina, Italy
[6] Med Univ S Carolina, Dept Publ Hlth Sci, Charleston, SC 29425 USA