Heterogeneous burden of lung disease in smokers with borderline airflow obstruction oleh Cheryl S. Pirozzi, Tian Gu, Pedro M. Quibrera, Elizabeth E. Carretta, MeiLan K. Han, Susan Murray, Christopher B. Cooper, Donald P. Tashkin, Eric C. Kleerup, Igor Barjaktarevic, Eric A. Hoffman, Carlos H. Martinez, Stephanie A. Christenson, Nadia N. Hansel, R. Graham Barr, Eugene R. Bleecker, Victor E. Ortega, Fernando J. Martinez, Richard E. Kanner, Robert Paine, for the NHLBI SubPopulations and InteRmediate Outcome Measures In COPD Study (SPIROMICS)