Asthma coexistence does not worsen or accelerate the decline in exercise capacity in COPD - Dennis Jensen; Jaycie Triandafilou; Pei Zhi Li; Michael K. Stickland; Jordan A. Guenette; Don D. Sin; Wan C. Tan; Jean Bourbeau; Alex R. Jenkins; on behalf of the CanCOLD Collaborative Research Group; Jean Bourbeau; Wan C. Tan; et al. (ERJ Open Research)