[1] UNC Hosp, Chapel Hill, NC USA
[2] Univ N Carolina, Dept Pediat, Chapel Hill, NC 27515 USA
[3] Univ N Carolina, Marsico Lung Inst, Chapel Hill, NC 27515 USA
[4] Seattle Childrens Hosp, Pulm Med, Seattle, WA USA
[5] Washington Univ, Sch Med, Pediat, St Louis, MO USA
[6] Univ Colorado, Sch Med, Pediat, Aurora, CO USA
[7] BC Childrens Hosp, Pediat, Vancouver, BC, Canada
[8] Stanford Univ, Pediat, Palo Alto, CA 94304 USA
[9] Marsico Lung Inst, Chapel Hill, NC USA
[10] Univ N Carolina, Cyst Fibrosis Res & Treatment Ctr, Marsico Lung Inst, Chapel Hill, NC 27515 USA
[11] North Carolina Childrens Hosp, Dept Pediat, Chapel Hill, NC USA