1. Royal Liverpool and Broadgreen University Hospitals NHS Trust; Department of Respiratory Paediatrics; Royal Liverpool University Hospital Prescot Street Liverpool UK L7 8XP
2. Alder Hey Children's NHS Foundation Trust; Physiotherapy Department; Eaton Road Liverpool UK L12 2AP
3. Alder Hey Children's NHS Foundation Trust; Department of Respiratory Physiotherapy; Eaton Road Liverpool UK L12 2AP
4. University of Liverpool; Department of Women's and Children's Health; Alder Hey Children's NHS Foundation Trust Eaton Road Liverpool Merseyside UK L12 2AP