1. St George's, University of London; Cochrane Airways, Population Health Research Institute; London UK SW17 0RE
2. Galway University Hospital; Department of Respiratory Medicine; Galway Ireland
3. Teesside University; School of Health and Social Care; Middlesbrough UK
4. Alfred Health; Physiotherapy; Melbourne Victoria Australia 3181
5. School of Allied Health, Human Services and Sport, La Trobe University; Discipline of Physiotherapy; Melbourne Victoria Australia 3086
6. Institute for Breathing and Sleep; Melbourne Australia