[1] Vet Affairs Greater Los Angeles Healthcare Syst, Dept Diagnost Radiol, Sect Thorac Imaging, 11301 Wilshire Blvd,Bldg 500, Los Angeles, CA 90073 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, 10833 Le Conte Ave, Los Angeles, CA 90095 USA
[3] Vet Affairs Palo Alto Healthcare Syst, Radiol Serv, Sect Cardiothorac Imaging, 3801 Miranda Ave, Palo Alto, CA 94304 USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Diagnost Radiol, 1515 Holcombe Blvd,Unit 1478, Houston, TX 77030 USA