Jane Upton, Judith Taylor-Fishwick, Sonia A. Buist, Christine Jenkins, John Hutton, Neil Barnes, Thys Van Der Molen, John W. Walsh, Paul Jones, and Samantha Walker, "COPD Uncovered: An International Survey on the Impact of Chronic Obstructive Pulmonary Disease [COPD[ on a Working-Age Population:' BMC Public H