1 Department of Health Research Methods, Evidence and Impact, McMaster University, 1280 Main St East, Hamilton, L8S 4L8, Canada.
2 Department of Health Research Methods, Evidence and Impact, McMaster University, 1280 Main St East, Hamilton, L8S 4L8, Canada; Department of Medicine, McMaster University, 1280, Main St East, L8S 4L8, Hamilton, Canada; Section Editor, Systematic Reviews and Methodology, Canadian Journal of Ophthalmology.