How Do Dual Long-acting Bronchodilators Prevent Exacerbations of Chronic Obstructive Pulmonary Disease?

Kai M Beeh, Pierre-Regis Burgel, Frits M E Franssen, Jose Luis Lopez-Campos, Stelios Loukides, John R Hurst, Matjaž Fležar, Charlotte Suppli Ulrik, Fabiano Di Marco, Daiana Stolz, Arschang Valipour, Brian Casserly, Björn Ställberg, Konstantinos Kostikas, Jadwiga A Wedzicha