1. Volume 139, Issue 4, Pages 752-763 (April 2011)
COPD in Never Smokers 
Bernd Lamprecht, MD, Mary Ann McBurnie, MD, William M. Vollmer, MD, Gunnar Gudmundsson, MD, FCCP, Tobias Welte, MD, Ewa Nizankowska-Mogilnicka, MD, FCCP, Michael Studnicka, MD, FCCP, Eric Bateman, MD, Josep M. Anto, MD, Peter Burney, MD, David M. Mannino, MD, FCCP, Sonia A. Buist, MD 
CHEST 
Volume 139, Issue 4, Pages (April 2011)
DOI: /chest
Copyright © 2011 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Prevalence of GOLD stage II+ COPD among participants by smoking status, sex, and age (y). GOLD = Global Initiative for Obstructive Lung Disease; GOLD stage II+ = GOLD stages II, III, and IV.
CHEST  , DOI: ( /chest )
Copyright © 2011 The American College of Chest Physicians Terms and Conditions