Dransfield Mark T, Lettis Sally, Barnhart Frank, Crim Courtney, Calverley Peter M A
AB Lung Health Center Division of Pulmonary, Allergy and Critical Care Medicine University of Alabama at Birmingham & Birmingham VA Medical Center, Birmingham, AL 35294, USA.
GlaxoSmithKline, London, UK.
Lancet Respir Med. 2013 Jul;1(5):e21-2. doi: 10.1016/S2213-2600(13)70125-5. Epub 2013 Jul 8.