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How Much Did Biases in the Study of Chronic Obstructive Pulmonary Disease Medications and Mortality Affect the Outcome?
Takeharu Koga, MD, PhD; Tomoko Kamimura, MD, PhD; Munetsugu Nishimura, MD
Annals of Internal Medicine 2009;150:426. doi:10.7326/0003-4819-150-6-200903170-00019

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