Design of the Subpopulations and Intermediate Outcomes in COPD Study (SPIROMICS)
David Couper, Lisa M LaVange, MeiLan Han, R Graham Barr, Eugene Bleecker, Eric A Hoffman, Richard Kanner, Eric Kleerup, Fernando J Martinez, Prescott G Woodruff, Stephen Rennard, for the SPIROMICS Research Group
Thorax May 2014, 69 (5) 492-495; DOI: 10.1136/thoraxjnl-2013-203897