title: Opponent's comments.
authors.affiliation: Centre for Evidence-Based Health Care, Department of Interdisciplinary Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
authors.forename: Tonya M
authors.initials: TM
authors.lastname: Esterhuizen
authors.affiliation: Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada Department of Anesthesia, McMaster University, Hamilton, ON, Canada Department of Pediatrics, McMaster University, Hamilton, ON, Canada FSORC, Research Institute at St Joseph's Healthcare, Hamilton, ON, Canada Biostatistics Unit, St Joseph's Healthcare, Hamilton, ON, Canada Population Health Research Institute, Hamilton Health Sciences, Hamilton, ON, Canada.
authors.forename: Lehana
authors.initials: L
authors.lastname: Thabane