RT Journal Article SR Electronic T1 The natural history of smoking during pregnancy among women in Nova Scotia JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 281 OP 282 VO 163 IS 3 A1 Susan A. Kirkland A1 Linda A. Dodds A1 Gerry Brosky YR 2000 UL http://www.cmaj.ca/content/163/3/281.abstract