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Viniol, Annika; Jegan, Nikita; Leonhardt, Corinna; Strauch, Konstantin; Brugger, Markus; Barth, Jürgen; Baum, Erika; Becker, Annette (2012). Study protocol: Transition from localized low back pain to chronic widespread pain in general practice: identification of risk factors, preventive factors and key elements for treatment--a cohort study. BMC musculoskeletal disorders, 13, p. 77. London: BioMed Central 10.1186/1471-2474-13-77
