[1] Univ Southern Calif, Keck Sch Med, Dept Family Med, Alhambra, CA USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Div Infect Dis, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Div Geriatr, 1731 E 120th St,Bldg J, Los Angeles, CA 90095 USA
[4] Univ Texas Houston, McGovern Med Sch, Div Infect Dis, Houston, TX USA
[5] Univ Calif San Diego, Dept Med, Div Geriatr, La Jolla, CA 92093 USA
[6] Univ Calif San Diego, Dept Psychiat, La Jolla, CA 92093 USA
[7] Charles R Drew Univ Med & Sci, Dept Psychiat & Human Behav, 1621 E 120th St, Los Angeles, CA 90059 USA