Defining cut-off values for disease activity states and improvement scores for patient-reported outcomes: the example of the Rheumatoid Arthritis Impact of Disease (RAID).
Arthritis Res Ther. 2012 May 30;14(3):R129. doi: 10.1186/ar3859.
Arthritis Res Ther. 2012.
PMID: 22647431
Free PMC article.
Clinical Trial.