Letter
Further evaluation of a claims-based algorithm to determine the effectiveness of biologics for rheumatoid arthritis using commercial claims data
Arthritis Research & Therapy 2013, 15:404 doi:10.1186/ar4161
See related research by Curtis et al., http://arthritis-research.com/content/13/5/R155, and related editorial by Kim and Solomon, http://arthritis-research.com/content/13/5/129
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