Email updates

Keep up to date with the latest news and content from Arthritis Research & Therapy and BioMed Central.

Open Access Email this article to a friend

Improved responsiveness and reduced sample size requirements of PROMIS physical function scales with item response theory

James F Fries*, Eswar Krishnan, Matthias Rose, Bharathi Lingala and Bonnie Bruce

Arthritis Research & Therapy 2011, 13:R147  doi:10.1186/ar3461

Fields marked * are required


Multiple email addresses should be separated with commas or semicolons.
How can I ensure that I receive Arthritis Research & Therapy's emails?