title: Cochrane column.
authors.affiliation: Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa. E-mail: charlesw@sun.ac.za shindon@who.int jvt@nottingham.ac.uk leibovic@post.tau.ac.il.
authors.forename: Charles S
authors.initials: CS
authors.lastname: Wiysonge
authors.affiliation: Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa.
authors.forename: Folasade B
authors.initials: FB
authors.lastname: Adeniyi
authors.affiliation: Pandemic and Epidemic Diseases Department, World Health Organization, Geneva, Switzerland shindon@who.int.
authors.forename: Nahoko
authors.initials: N
authors.lastname: Shindo
authors.affiliation: Pandemic and Epidemic Diseases Department, World Health Organization, Geneva, Switzerland.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Briand
authors.affiliation: Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK, Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK jvt@nottingham.ac.uk.
authors.forename: Jonathan S
authors.initials: JS
authors.lastname: Nguyen-Van-Tam
authors.affiliation: Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK, Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK.
authors.forename: Karl G
authors.initials: KG
authors.lastname: Nicholson
authors.affiliation: Department of Medicine E, Beilinson Hospital, Petah-Tiqva, Israel, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel and Infectious Diseases Institute, Technion-Israel Institute of Technology, Haifa, Israel Department of Medicine E, Beilinson Hospital, Petah-Tiqva, Israel, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel and Infectious Diseases Institute, Technion-Israel Institute of Technology, Haifa, Israel leibovic@post.tau.ac.il.
authors.forename: Leonard
authors.initials: L
authors.lastname: Leibovici
authors.affiliation: Department of Medicine E, Beilinson Hospital, Petah-Tiqva, Israel, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel and Infectious Diseases Institute, Technion-Israel Institute of Technology, Haifa, Israel Department of Medicine E, Beilinson Hospital, Petah-Tiqva, Israel, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel and Infectious Diseases Institute, Technion-Israel Institute of Technology, Haifa, Israel.
authors.forename: Mical
authors.initials: M
authors.lastname: Paul