Exacerbations in non-COPD patients: truth or myth-authors' response. - Tan, Wan C; Bourbeau, Jean; Aaron, Shawn; FitzGerald, J Mark; Hernandez, Paul; Cowie, Robert; Chapman, Kenneth R; Marciniuk, Darcy; Maltais, Francois; Buist, Sonia; O'Donnell, Denis; Sin, Don D; et al. (Thorax, 2014)