Affiliations:
1National Heart & Lung Institute, Imperial College London, London, UK;
2Complexo Hospitalario Universitario de Ferrol, A Coruña, Spain;
3Hospital Clínic de Barcelona, Barcelona, Spain;
4Royal Brompton and Harefield Hospitals NHS Foundation Trust, London, UK;
5Division of Infection, Immunity & Respiratory Medicine, Manchester Institute of Biotechnology, University of Manchester, Manchester, UK