1. Cystic Fibrosis Unit, Virgen de la Arrixaca University Hospital, Murcia, Spain
2. Cystic Fibrosis Unit, Cruces University Hospital, Bilbao, Spain
3. IMIB Bio-Research Institute, Murcia, Spain
4. Pediatric Pulmonology and Cystic Fibrosis Unit, Clinic University Hospital, Valencia, Spain
5. University of Valencia, Valencia, Spain