1 Department of Adult Critical Care, Guy's and St. Thomas' NHS Foundation Trust, King's Health Partners, and Division of Asthma, Allergy and Lung Biology, King's College London, London, UK - luigi.camporota@gstt.nhs.uk.
2 Department of Adult Critical Care, Guy's and St. Thomas' NHS Foundation Trust, King's Health Partners, and Division of Asthma, Allergy and Lung Biology, King's College London, London, UK.