title: Reply.
authors.affiliation: National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Ward
authors.affiliation: Oregon Health & Science University, Portland, OR.
authors.forename: Atul
authors.initials: A
authors.lastname: Deodhar
authors.affiliation: University of Texas Health Sciences Center at Houston.
authors.forename: John D
authors.initials: JD
authors.lastname: Reveille
authors.affiliation: Denver Veterans Affairs Medical Center and University of Colorado, Aurora, CO.
authors.forename: Liron
authors.initials: L
authors.lastname: Caplan