[1] Univ Calif San Francisco, Radiol & Biomed Imaging, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Neurol, San Francisco, CA 94143 USA
[3] San Francisco Gen Hosp, San Francisco, CA 94110 USA
[4] Trauma Ctr, San Francisco, CA USA
[5] San Francisco Gen Hosp, Brain & Spinal Injury Ctr, San Francisco, CA 94110 USA
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA