[1] Univ Hawaii, John A Burns Sch Med, Honolulu, HI 96822 USA
[2] Univ Hawaii, John A Burns Sch Med, Trop Med Med Microbiol & Pharmacol, Honolulu, HI 96822 USA
[3] Univ Calif San Francisco, Dept Neurol, Memory & Aging Ctr, San Francisco, CA USA
[4] Univ Calif San Francisco, Div Geriatr, San Francisco, CA 94143 USA