title: TO THE EDITOR.
authors.affiliation: *Division of Neurosurgery, Addenbrooke's Hospital & University of Cambridge, Cambridge, UK†MRC North West Hub for Trials Methodology Research, Department of Biostatistics, University of Liverpool, Liverpool, UK‡Centre for Surgical Research, School of Social and Community Medicine, University of Bristol, Bristol, UK.
authors.forename: Angelos G
authors.initials: AG
authors.lastname: Kolias
authors.forename: Paula R
authors.initials: PR
authors.lastname: Williamson
authors.forename: Jane M
authors.initials: JM
authors.lastname: Blazeby