Systematic Review: Once Daily Long-acting Beta2-agonists + Long-acting Muscarinic Antagonists in a Combined Inhaler vs. Placebo for COPD

Once daily long‐acting beta2‐agonists and long‐acting muscarinic antagonists in a combined inhaler versus placebo for chronic obstructive pulmonary disease – Cochrane Library (free)

Summary: Once daily long-acting beta2-agonists and long-acting muscarinic antagonists in a combined inhaler versus placebo for COPD – Cochrane Library (free)