1. Division of Lung Diseases, Geneva University Hospitals, Geneva, Switzerland
2. Faculty of Medicine, University of Geneva Medical School, Geneva, Switzerland
3. Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
4. Keenan Research Centre, Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Canada
5. Division of Internal Medicine, A.O.U. Città della Salute e della Scienza di Torino, Turin, Italy