[1] Univ Tubingen, Dept Pediat 1, Tubingen, Germany
[2] Univ Alabama Birmingham, Dept Med, Birmingham, AL 35294 USA
[3] Univ Alabama Birmingham, Dept Physiol Biophys, Birmingham, AL USA
[4] Yale Univ, Sch Med, Dept Pediat, New Haven, CT 06510 USA
[5] Univ Munich, Dept Pediat, Munich, Germany
[6] Univ Childrens Hosp, Dept Resp Med, Zurich, Switzerland
[7] Beaumont Hosp, Royal Coll Surg Ireland, Educ & Res Ctr, Resp Res Div, Dublin 9, Ireland
[8] Heidelberg Univ, Div Pediat Pulmonol & Allergy, Heidelberg, Germany
[9] Heidelberg Univ, Cyst Fibrosis Ctr, Dept Pediat 3, Heidelberg, Germany