[1] Stanford Univ, Dept Med, Sch Med, Stanford Prevent Res Ctr, Stanford, CA 94305 USA
[2] Univ Basel Hosp, Basel Inst Clin Epidemiol & Biostat, Basel, Switzerland
[3] Stanford Univ, Dept Pediat, Sch Med, Div Infect Dis, Stanford, CA 94305 USA
[4] Stanford Univ, Res Innovat Ctr Stanford METRICS, Sch Med, Stanford, CA 94305 USA
[5] Stanford Univ, Dept Hlth Res & Policy, Sch Med, Stanford, CA 94305 USA
[6] Stanford Univ, Dept Stat, Sch Humanities & Sci, Stanford, CA 94305 USA