Long-acting beta2-agonist in addition to tiotropium versus either tiotropium or long-acting beta2-agonist alone for… https://t.co/8db2nLECXt
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For COPD, is it better to take a combination of tiotropium and long-acting beta2-agonists? https://t.co/ndmQ3vhpWK from Cochrane reviews. Y…