1 Department of Respiratory Medicine, St. Vincent's University Hospital, Dublin, Ireland.
2 Department of Medicine, Tallaght University Hospital, Tallaght.
3 Department of Histopathology, St. Vincent's University Hospital, Dublin, Ireland; School of Medicine, University College Dublin, Dublin, Ireland.
4 Department of Radiology, St. Vincent's University Hospital, Dublin, Ireland.
5 Department of Respiratory Medicine, St. Vincent's University Hospital, Dublin, Ireland; School of Medicine, University College Dublin, Dublin, Ireland.
6 Department of Respiratory Medicine, St. Vincent's University Hospital, Dublin, Ireland; School of Medicine, University College Dublin, Dublin, Ireland. Electronic address: Cormac.McCarthy@UCD.ie.