[1] St Vincent Hosp, Dept Radiol, Worcester, MA USA
[2] Keck Sch Med USC, Dept Radiol, Los Angeles, CA 90033 USA
[3] Vet Adm Greater Los Angeles Healthcare Med Ctr, Dept Radiol, Los Angeles, CA USA
[4] Gen Med Ctr, Radiol, Los Angeles, CA USA
[5] Keck Sch Med USC, USC PET Ctr, Dept Radiol, Radiol & Pharmacol & Pharmaceut Sci, 1510 San Pablo St, Los Angeles, CA 90033 USA