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Better assessment of physical function: item improvement is neglected but essential

Bonnie Bruce*, James F Fries, Debbie Ambrosini, Bharathi Lingala, Barbara Gandek, Matthias Rose and John E Ware

Arthritis Research & Therapy 2009, 11:R191 doi:10.1186/ar2890


See related editorial by Aletaha, http://arthritis-research.com/content/12/1/104

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