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Development and assessment of floor and ceiling items for the PROMIS physical function item bank

Bonnie Bruce*, James Fries, Bharathi Lingala, Yusra Nazar Hussain and Eswar Krishnan

Arthritis Research & Therapy 2013, 15:R144  doi:10.1186/ar4327

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http://arthritis-research.com/content/15/5/R144
ar4327