[1] UNIV CALIF SAN FRANCISCO, SAN FRANCISCO GEN HOSP, GLADSTONE INST VIROL & IMMUNOL, SAN FRANCISCO, CA 94110 USA
[2] UNIV CALIF SAN FRANCISCO, SAN FRANCISCO GEN HOSP, DEPT MED, DIV AIDS, SAN FRANCISCO, CA 94110 USA
[3] UNIV CALIF SAN FRANCISCO, DEPT MICROBIOL & IMMUNOL, SAN FRANCISCO, CA 94143 USA
[4] UNIV CALIF BERKELEY, DEPT NUTR SCI, BERKELEY, CA 94720 USA
[5] UNIV CALIF SAN FRANCISCO, SAN FRANCISCO GEN HOSP, DEPT MED, DIV ENDOCRINOL & METAB, SAN FRANCISCO, CA USA