RT Journal Article SR Electronic T1 Periodic health examination, 1990 update: 3. Interventions to prevent lung cancer other than smoking cessation JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1289 OP 1290 VO 143 IS 12 A1 Esdaile, D. S. YR 1990 UL http://www.cmaj.ca/content/143/12/1289.abstract