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Comment
. 2011 Jun 30;364(26):2552; author reply 2553-4.
doi: 10.1056/NEJMc1104617.

Tiotropium versus salmeterol in COPD

Louise Restrick, Myra Stern, Noel Baxter
Comment

Tiotropium versus salmeterol in COPD

Louise Restrick et al. N Engl J Med. .
No abstract available

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