[1] Univ Hosp Leuven, Dept Pneumol, Leuven, Belgium
[2] Univ Giessen, Giessen, Germany
[3] Marburg Lung Ctr, Giessen, Germany
[4] German Ctr Lung Res, Giessen, Germany
[5] Univ Calif San Diego, Pulm & Crit Care Med, La Jolla, CA 92093 USA
[6] Royal Papworth Hosp, Cambridge, England
[7] Actel Pharmaceut Ltd, Allschwil, Switzerland
[8] Univ Calif Los Angeles, Los Angeles, CA USA