title: Cochrane column.
authors.affiliation: South African Cochrane Centre, Medical Research Council, PO Box 19070, Tygerberg 7505, South Africa. taryn.young@mrc.ac.za
authors.forename: Taryn
authors.initials: T
authors.lastname: Young
authors.forename: Mike
authors.initials: M
authors.lastname: Clarke
authors.forename: Sally
authors.initials: S
authors.lastname: Hopewell
authors.forename: Ed
authors.initials: E
authors.lastname: Juszczak
authors.forename: Anne
authors.initials: A
authors.lastname: Eisinga
authors.forename: Monica
authors.initials: M
authors.lastname: Kjeldstrøm
authors.forename: Gdo
authors.initials: G
authors.lastname: Lowe