[1] Med Univ S Carolina, Charleston, SC 29425 USA
[2] Univ Massachusetts, Sch Med, Dept Pediat, Worcester, MA USA
[3] Johns Hopkins Med Inst, Dept Med, Baltimore, MD 21205 USA
[4] Univ Washington, Dept Med, Seattle, WA USA
[5] Johns Hopkins Med Inst, Dept Pediat, Baltimore, MD 21205 USA
[6] Univ Texas Hlth Ctr, Dept Pediat, San Antonio, TX USA
[7] Texas Childrens Hosp, Dept Nursing, Houston, TX 77030 USA
[8] Univ Pittsburgh, Sch Med, Dept Pediat, Pittsburgh, PA 15261 USA
[9] Med Univ S Carolina, Dept Resp Therapy, Charleston, SC USA
[10] Columbia Univ, Dept Pediat, New York, NY USA
[11] SW Texas State Univ, Dept Med, Dallas, TX USA
[12] Penn State Milton S Hershey Med Ctr, Dept Med, Hershey, PA USA
[13] Cyst Fibrosis Fdn, Bethesda, MD USA
[14] Dartmouth Hitchcock Med Ctr, Lebanon, NH 03766 USA