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Supplementing claims data with outpatient laboratory test results to improve confounding adjustment in effectiveness studies of lipid-lowering treatments

Sebastian Schneeweiss*, Jeremy A Rassen, Robert J Glynn, Jessica Myers, Gregory W Daniel, Joseph Singer, Daniel H Solomon, SeoYoung Kim, Kenneth J Rothman, Jun Liu and Jerry Avorn

BMC Medical Research Methodology 2012, 12:180  doi:10.1186/1471-2288-12-180