Pitfalls of measuring smoking status.
Gill
G
G
MacFarlane
I
I
Ismail
A
A
D017954:Africa South of the Sahara / Q000453:epidemiology; D002248:Carbon Monoxide / Q000378:metabolism*; D006801:Humans; D012680:Sensitivity and Specificity; D012907:Smoking / Q000453:epidemiology / Q000378:metabolism*
D002248:Carbon Monoxide