[1] Yale Univ, Dept Diagnost Radiol, New Haven, CT 06510 USA
[2] Cincinnati Childrens Hosp Med Ctr, Dept Radiol, Cincinnati, OH USA
[3] Bridgeport Hosp, Dept Radiol, Westport, CT USA
[4] Univ Michigan Hosp, Dept Radiol, Ann Arbor, MI 48109 USA
[5] Boston Univ, Med Ctr, Dept Radiol, Boston, MA 02118 USA
[6] Scottsdale Med Imaging, Scottsdale, AZ USA
[7] Walter Reed Army Med Ctr, Dept Radiol, Washington, DC 20307 USA
[8] Univ Washington, Dept Radiol, Seattle, WA 98195 USA