title: Percentage of patients with spondyloarthritis in patients referred because of chronic back pain and performance of classification criteria: experience from the Spondyloarthritis Caught Early (SPACE) cohort.
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Rosaline
authors.initials: R
authors.lastname: van den Berg
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Manouk
authors.initials: M
authors.lastname: de Hooge
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Floris
authors.initials: F
authors.lastname: van Gaalen
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Monique
authors.initials: M
authors.lastname: Reijnierse
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Tom
authors.initials: T
authors.lastname: Huizinga
authors.affiliation: Department of Rheumatology and Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Désirée
authors.initials: D
authors.lastname: van der Heijde