1 Department of Medicine, McMaster University, Hamilton, ON, Canada; Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.
2 Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada; Interdepartmental Division of Critical Care Medicine, University of Toronto, Hamilton and Toronto, ON, Canada.
3 Department of Medicine, McMaster University, Hamilton, ON, Canada; Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada. Electronic address: rochwerg@mcmaster.ca.