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      In his correspondence, Jones raises questions regarding study methodology, potential confounding factors related to LDL cholesterol response observed in different populations treated with the same dose of atorvastatin therapy, alternative explanations for differences in short- and long-term treatment to goal rates in head-to-head comparisons of simvastatin and atorvastatin, doubt about development of LDL cholesterol tachyphylaxis with any HMG CoA reductase inhibitor (statin) over the time course observed in our study, and the uniqueness of tachyphylaxis to a particular agent based on half-life.
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