title: Ms. A.M. Taylor, et al reply.
authors.affiliation: Cardiff University, Cardiff, UK; TaylorAM@cardiff.ac.uk.
authors.forename: Ann M
authors.initials: AM
authors.lastname: Taylor
authors.affiliation: Barry Chiropractic Clinic, Cardiff, UK;
authors.forename: Justin O
authors.initials: JO
authors.lastname: Taylor
authors.affiliation: Medicine Service, VA Medical Center, Department of Medicine at the School of Medicine, and Division of Epidemiology at the School of Public Health, University of Alabama at Birmingham, and Department of Orthopedic Surgery, Mayo Clinic College of Medicine, Birmingham, Alabama, USA;
authors.forename: Jasvinder A
authors.initials: JA
authors.lastname: Singh
authors.affiliation: Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds and UK National Institute for Health Research Leeds Musculoskeletal Biomedical Research Unit, Leeds, UK;
authors.forename: Philip G
authors.initials: PG
authors.lastname: Conaghan
authors.affiliation: Cardiff University, Cardiff, UK;
authors.forename: Ernest H
authors.initials: EH
authors.lastname: Choy
authors.affiliation: Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada;
authors.forename: Peter S
authors.initials: PS
authors.lastname: Tugwell
authors.affiliation: University Hospital Carl Gustav Carus, Dresden, Germany;
authors.forename: Ulrike
authors.initials: U
authors.lastname: Kaiser
authors.affiliation: Division of Immunology/Rheumatology, Stanford University, Palo Alto, California, USA;
authors.forename: Vibeke
authors.initials: V
authors.lastname: Strand
authors.affiliation: SDG LLC, Cambridge, Massachusetts, USA;
authors.forename: Lee S
authors.initials: LS
authors.lastname: Simon
authors.affiliation: Swedish Medical Center and University of Washington, Seattle, Washington, USA.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Mease