[1] Franciscan Hosp Children, Res Ctr Children Special Hlth Care Needs, Boston, MA 02135 USA
[2] Franciscan Hosp Children, Dept Pulmonol, Boston, MA 02135 USA
[3] Boston Univ, Hlth & Disabil Res Inst, Boston, MA 02215 USA
[4] Harvard Univ, Childrens Hosp, Sch Med, Div Resp Dis, Boston, MA 02115 USA
[5] Blythedale Childrens Hosp, Valhalla, NY USA
[6] Childrens Specialized Hosp, Div Pediat, Mountainside, NJ USA
[7] Childrens Hosp Rehabil, Cleveland Clin, Cleveland, OH USA
[8] Metrohlth Med Ctr, Dept Pediat, Cleveland, OH 44109 USA
[9] Case Western Reserve Univ, Sch Med, Cleveland, OH USA
[10] Hosp Special Care, Dept Pediat, New Britain, CT USA
[11] Childrens Hosp, Richmond, VA USA
[12] Virginia Commonwealth Univ, Med Coll Virginia, Div Pediat Phys Med & Rehabil, Richmond, VA 23298 USA