title: TO THE EDITOR.
authors.affiliation: *Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands †Department of Neurosurgery, Leiden University Medical Center, Leiden, The Netherlands ‡Rehabilitation Center 'De Hoogstraat', Utrecht, The Netherlands §Department of Rehabilitation Medicine, Center for Rehabilitation, University Medical Center Groningen, Groningen, The Netherlands ¶AO Foundation, Davos, Switzerland.
authors.forename: Said
authors.initials: S
authors.lastname: Sadiqi
authors.forename: A Mechteld
authors.initials: AM
authors.lastname: Lehr
authors.forename: Wilco C H
authors.initials: WC
authors.lastname: Jacobs
authors.forename: Marcel W
authors.initials: MW
authors.lastname: Post
authors.forename: F Cumhur
authors.initials: FC
authors.lastname: Oner