title: Response to comment on letter for: 'Prevalence of brain magnetic resonance imaging meeting Barkhof and McDonald criteria for dissemination in space among headache patients'.
authors.affiliation: Oregon Health and Science University, Diagnostic Radiology, USA hamiltob@ohsu.edu.
authors.forename: Bronwyn
authors.initials: B
authors.lastname: Hamilton
authors.affiliation: Long Beach Memorial Hospital, Internal Medicine, USA.
authors.forename: Syrone
authors.initials: S
authors.lastname: Liu
authors.affiliation: Portland VA Medical Center-Imaging, USA.
authors.forename: Jack H
authors.initials: JH
authors.lastname: Simon
authors.affiliation: Neurology, Oregon Health & Science University, USA.
authors.forename: Dennis
authors.initials: D
authors.lastname: Bourdette