1. National Health and Medical Research Council Centre of Excellence in Severe Asthma, Newcastle, Australia;
2. Priority Research Centre for Healthy Lungs, The University of Newcastle, New Lambton, Australia;
3. School of Nursing and Midwifery, The University of Newcastle, Callaghan, Australia;
4. Hunter Medical Research Institute, New Lambton, Australia;
5. Department of Respiratory and Sleep Medicine, John Hunter Hospital, Newcastle, Australia;
6. Division of Nursing, Midwifery & Social Work, University of Manchester, Manchester, UK;
7. Christie NHS Foundation Trust, Manchester, UK;
8. Manchester Academic Health Sciences Centre, University of Manchester, Manchester, UK