[1] Washington Univ, Mallinckrodt Inst Radiol, Sch Med, 510 S Kingshighway Blvd,Campus Box 8131, St. Louis, MO 63110 USA
[2] Stanford Univ, Dept Radiol, Div Nucl Med, Sch Med, Stanford, CA USA
[3] Univ Calif San Diego, Dept Radiol, Div Nucl Med, San Diego, CA USA
[4] Transparent Imaging, Brooklyn, NY USA
[5] Virtual Radiol, Eden Prairie, MN USA
[6] Univ Alabama Birmingham, Dept Radiol, Birmingham, AL USA