1 Interdepartmental Division of Critical Care, University of Toronto and Consultant in Intensive Care Medicine at the Toronto Western Hospital, Toronto, Canada. elizabeth.wilcox@mail.utoronto.ca.
2 Department of Medicine, Division of Respirology, Toronto Western Hospital, McLaughlin Wing 2-411M, 399 Bathurst Street, Toronto, ON, M5T 2S8, Canada. elizabeth.wilcox@mail.utoronto.ca.
3 School of Immunology and Microbial Sciences, King's College London, London, UK.
4 Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London, UK.
5 Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Ireland.
6 Regional Intensive Care Unit, Royal Victoria Hospital, Belfast, Ireland.