[1] Duke Univ, Sch Med, Dept Pediat, Durham, NC 27704 USA
[2] Duke Univ, Dept Populat Hlth Sci, Sch Med, Durham, NC 27704 USA
[3] Duke Univ, Duke Clin Res Inst, Durham, NC 27704 USA
[4] Duke Univ, Dept Biostat & Bioinformat, Sch Med, Durham, NC 27704 USA
[5] Duke Univ, Duke Microbiome Ctr, Dept Mol Genet & Microbiol, Sch Med, Durham, NC 27704 USA
[6] Northwestern Univ, Dept Pediat, Feinberg Sch Med, Chicago, IL 60611 USA
[7] Duke Univ, Sch Med, 4020 N Roxboro St, Durham, NC 27704 USA