Chronic obstructive pulmonary disease mortality and prevalence: the associations with smoking and poverty: a BOLD analysis—authors' reply. Issue 9 (1st May 2014) - Burney, Peter; Kato, Bernet; Janson, Christer; Mannino, David; Studnicka, Michael; Tan, Wan; Bateman, Eric; Koçabas, Ali; Vollmer, William M; Gislason, Thorarrin; Marks, Guy; Koul, Parvaiz A; et al.