[1] New York Med Coll, Div Infect Dis, Dept Med, Valhalla, NY 10595 USA
[2] New York Med Coll, Dept Pathol, Valhalla, NY 10595 USA
[3] Harbor UCLA Med Ctr, LA Biomed Res Inst, Torrance, CA 90509 USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[5] Univ Calif San Diego, Sch Med, La Jolla, CA 92093 USA
[6] Sharp Mem Hosp & Rehabil Ctr, Dept Med, San Diego, CA USA