1 King's College London, Cicely Saunders Institute, Division of Palliative Care, Policy & Rehabilitation, London SE5 9PJ, UK. Electronic address: matthew.maddocks@kcl.ac.uk.
2 NIHR Respiratory Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust and Imperial College, London, UK; Harefield Pulmonary Rehabilitation Team, Harefield Hospital, UK.
3 NIHR Respiratory Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust and Imperial College, London, UK.
4 Lane Fox Unit, Guy's & St Thomas' NHS Foundation Trust, London, UK; King's College London, Respiratory Medicine, Division of Asthma, Allergy & Lung Biology, London, UK.
5 King's College London, Cicely Saunders Institute, Division of Palliative Care, Policy & Rehabilitation, London SE5 9PJ, UK.
6 King's College London, Respiratory Medicine, Division of Asthma, Allergy & Lung Biology, London, UK.