Clinical importance of changes in chronic pain intensity ...

Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale John T. Farrara,*, James P. Young Jr.b, Linda LaMoreauxb, John L. Werthb, R. Michael Pooleb aDepartment of Biostatistics and Epidemiology, University of Pennsylvania School of Medicine, Blockley Hall, Room 816, 423 Guardian Drive, Philadelphia, PA 19104, USA

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