Prevalence and pattern of co-occurring musculoskeletal pain and its association with back-related disability among people with persistent low back pain: protocol for a systematic r... by Cecilie K. Overaas, Melker S. Johansson, Tarcisio F. de Campos, Manuela L. Ferreira, Bard Natvig, Paul J. Mork, Jan Hartvigsen

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