Changes in chronic pain severity over time: the Chronic Pain Grade as a valid measure von Elliott, Alison M, Smith, Blair H, Smith, W.Cairns, Chambers, W.Alastair

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The Chronic Pain Grade questionnaire: validation and reliability in postal research von Smith, Blair H, Penny, Kay I, Purves, Alison M, Munro, Calum, Wilson, Brenda, Grimshaw, Jeremy, Chambers, W.Alastair, Smith, W.Cairns

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The Level of Expressed Need—a measure of help-seeking behaviour for chronic pain in the community von Smith, Blair H., Penny, Kay I., Elliott, Alison M., Chambers, W.Alastair, Smith, W.Cairns

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