[1] Univ Washington, Dept Biostat, Seattle, WA 98195 USA
[2] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[3] Seattle Childrens Res Inst, Ctr Clin & Translat Med, Seattle, WA USA
[4] Johns Hopkins Univ, Sch Med, Dept Med, Baltimore, MD 21205 USA
[5] Univ N Carolina, Cyst Fibrosis Pulm Res & Treatment Ctr, Chapel Hill, NC USA
[6] Univ N Carolina, Dept Biostat, Chapel Hill, NC USA
[7] Univ Washington, Dept Genome Sci, Seattle, WA 98195 USA
[8] Seattle Childrens Res Inst, Trueman Katz Ctr Pediat Bioeth, Seattle, WA USA
[9] Seattle Childrens Hosp, Div Pulm Med, Seattle, WA USA
[10] Seattle Childrens Hosp, Div Med Genet, Seattle, WA USA