[1] George Washington Univ, Sch Publ Hlth, Dept Epidemiol, Milken Inst, 950 New Hampshire Ave,NW Suite 507, Washington, DC 20052 USA
[2] George Washington Univ, Sect Innovat Practice, Dept Emergency Med, Washington, DC USA
[3] George Washington Univ, Med Fac Associates Inc, Washington, DC USA
[4] Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA
[5] Gilead Sci Inc, 353 Lakeside Dr, Foster City, CA 94404 USA