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A functional difficulty and functional pain instrument for hip and knee osteoarthritis

Alan M Jette*, Christine M McDonough, Pengsheng Ni, Stephen M Haley, Ronald K Hambleton, Sippy Olarsch, David J Hunter, Young-jo Kim and David T Felson

Arthritis Research & Therapy 2009, 11:R107  doi:10.1186/ar2760

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