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Chan KS, Chang E, Nassery N, Chang HY, Segal JB.Chan KS, et al.Med Care Res Rev. 2013 Oct;70(5):473-96. doi: 10.1177/1077558713492202. Epub 2013 Jun 26.Med Care Res Rev. 2013.PMID: 23804290Review.
Daubresse M, Chang HY, Yu Y, Viswanathan S, Shah ND, Stafford RS, Kruszewski SP, Alexander GC.Daubresse M, et al.Med Care. 2013 Oct;51(10):870-8. doi: 10.1097/MLR.0b013e3182a95d86.Med Care. 2013.PMID: 24025657Free PMC article.