1 Division of Pulmonary, Critical Care & Sleep Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA, USA. Electronic address: fchristian@floridalungdoctors.com.
2 University College Dublin School of Medicine, Health Sciences Centre, Belfield, Dublin, Ireland.
3 Division of Pulmonary, Critical Care & Sleep Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA, USA.