RT Journal Article SR Electronic T1 A novel hypothesis to explain associations of carbon monoxide and nitrogen dioxide with deaths from respiratory disease JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 173 OP 174 DO 10.1136/jech.2008.080630 VO 63 IS 2 A1 Joseph, P M YR 2009 UL http://jech.bmj.com/content/63/2/173.2.abstract AB