title: Author response.
authors.forename: Clare E
authors.initials: CE
authors.lastname: Mackay
authors.forename: Konrad
authors.initials: K
authors.lastname: Szewczyk-Krolikowski
authors.forename: Yoav
authors.initials: Y
authors.lastname: Ben-Shlomo
authors.forename: Michele
authors.initials: M
authors.lastname: Hu
mesh_terms: D001479:Basal Ganglia / Q000503:physiopathology*; D005260:Female; D059907:Functional Neuroimaging / Q000379:methods*; D006801:Humans; D008297:Male; D009415:Nerve Net / Q000503:physiopathology*; D010300:Parkinson Disease / Q000503:physiopathology*