1. Is Exposure to Biomass Smoke the Biggest Risk Factor for COPD Globally? 
Sundeep Salvi, MD, DNB, PhD, FCCP, Peter J. Barnes, DM, FCCP 
CHEST 
Volume 138, Issue 1, Pages 3-6 (July 2010)
DOI: /chest
Copyright © 2010 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Women are exposed to high levels of biomass fuel smoke (∼ 60,000 h of exposure during their lifetime).
CHEST  , 3-6DOI: ( /chest )
Copyright © 2010 The American College of Chest Physicians Terms and Conditions