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How Much Did Biases in the Study of Chronic Obstructive Pulmonary Disease Medications and Mortality Affect the Outcome?

Todd A. Lee, PharmD, PhD; A. Simon Pickard, PhD; David H. Au, MD, MS

Annals of Internal Medicine 2009;150:426-427. doi:10.7326/0003-4819-150-6-200903170-00020

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Annals of Internal Medicine

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