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The validity of a rheumatoid arthritis medical records-based index of severity compared with the DAS28

Masayo Sato, Sebastian Schneeweiss, Richard Scranton, Jeffrey N Katz, Michael E Weinblatt, Jerry Avorn, Gladys Ting, Nancy A Shadick and Daniel H Solomon*

Arthritis Research & Therapy 2006, 8:R57  doi:10.1186/ar1921

See related commentary by Landewe & van der Heijde in this issue