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Tiotropium in Combination with Placebo, Salmeterol, or Fluticasone–Salmeterol for Chronic Obstructive Pulmonary Disease: Possible Confounding Effect of Treatment Withdrawal?
Samuel M. Brown, MD
Annals of Internal Medicine 2007;147:882. doi:10.7326/0003-4819-147-12-200712180-00011

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