[1] Univ Calif Los Angeles, Dept Neurol, Los Angeles, CA 90024 USA
[2] Univ Hawaii, John A Burns Sch Med, Honolulu, HI 96822 USA
[3] Univ Calif Los Angeles, Div GIM & HSR, Los Angeles, CA USA
[4] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[5] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA
[6] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA