title: First versus second portion of expired air and duration of breath holding in the sampling of expired air carbon monoxide.
authors.forename: A
authors.initials: A
authors.lastname: Biglan
authors.forename: K
authors.initials: K
authors.lastname: Magis
authors.forename: A
authors.initials: A
authors.lastname: Dirocco
authors.forename: A
authors.initials: A
authors.lastname: Silverblatt
mesh_terms: D000293:Adolescent; D000328:Adult; D001944:Breath Tests / Q000379:methods*; D002248:Carbon Monoxide / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D012907:Smoking; D013997:Time Factors
chemical_list: D002248:Carbon Monoxide