Combining tiotropium and salmeterol in COPD: Effects on airflow obstruction and symptoms
- J. A. van Noord*
- , J. -L. Aumann
- , E. Janssens
- , J. J. Smeets
- , J. Zaagsma
- , A. Mueller
- , P. J. G. Cornelissen
*Corresponding author for this work
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