1. School of Nursing, Midwifery and Social Work, University of Manchester, Manchester, UK
2. Department of Behavioural Medicine, School of Psychological Sciences and Health, University of Strathclyde, Glasgow, Scotland, UK
3. Consultant Clinical Psychologists, Psychological Service, Royal Brompton and Harefield NHS Foundation Trust, London, UK
4. Department of Applied Psychology, Therapies, University of Salford, Salford, UK
5. North West Lung Centre University Hospital South Manchester, Manchester, UK