1. Division of General Surgery, McMaster University , Hamilton, Ontario , Canada
2. Harvard T.H. Chan School of Public Health, Harvard University , Boston, MA , USA
3. Faculty of Medicine, Dalhousie University , Halifax, Nova Scotia , Canada
4. Department of Health Research Methods , Evidence and Impact, , Hamilton, Ontario , Canada
5. McMaster University , Evidence and Impact, , Hamilton, Ontario , Canada
6. Division of Thoracic Surgery, McMaster University , Hamilton, Ontario , Canada