title: Reply.
authors.affiliation: St Vincent's Clinical School, UNSW Australia, Sydney, Australia.
authors.forename: Milton
authors.initials: M
authors.lastname: Cohen
authors.affiliation: Department of Clinical Neuroscience, Karolinska Institutet and Stockholm Spine Center, Stockholm, Sweden.
authors.forename: Eva
authors.initials: E
authors.lastname: Kosek
authors.affiliation: Division of Neurological Pain Research and Therapy, Department of Neurology, Universitaetsklinikum Schleswig-Holstein, Campus Kiel, Kiel, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Baron
authors.affiliation: Department of Neuroscience, CIBER of Mental Health, CIBERSAM, University of Cadiz, Cadiz, Spain.
authors.forename: Juan-Antonio
authors.initials: JA
authors.lastname: Mico
authors.affiliation: Department of Surgery and Cancer, Imperial College, Chelsea and Westminster Hospital campus, London, United Kingdom.
authors.forename: Andrew S C
authors.initials: ASC
authors.lastname: Rice