1. Cystic Fibrosis Center, Ciniques Universitaires St-Luc (UCL), Brussels, Belgium
2. Zeepreventorium VZW, De Haan, Belgium.
3. Cystic Fibrosis Center, Hôpital Universitaire des Enfants Reine Fabiola, Brussels, Belgium.
4. Cystic Fibrosis Center, Hôpital Académique Erasme, Brussels, Belgium.
5. Cystic Fibrosis Center, Academisch Ziekenhuis, Brussels, Belgium.
6. Cystic Fibrosis Center, Universitair Ziekenhuis Gasthuisberg, Leuven, Belgium.