1 Department of Respiratory Medicine, Cork University Hospital, Cork, Ireland; The HRB Clinical Research Facility, University College Cork, Cork, Ireland. Electronic address: desmond.murphy@hse.ie.
2 The Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, England.
3 Department of Respiratory Medicine, Cork University Hospital, Cork, Ireland; The HRB Clinical Research Facility, University College Cork, Cork, Ireland.
4 The APC Microbiome Institute, Schools of Medicine and Microbiology, University College Cork, Cork, Ireland.