Cut-off points for mild, moderate and severe pain on the numeric rating scale for pain in patients with chronic musculoskeletal pain: variability and influence of sex and catastrop... by Anne M. Boonstra, Roy E. Stewart, Albère J.A. Koke, René F.A. Oosterwijk, Jeannette L. Swaan, Karlein M.G. Schreurs, Henrica R. Schiphorst Preuper

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