[1] Publ Hlth Agcy Canada, Ctr Chron Dis Prevent & Control, Sci Integrat Div, Ottawa, ON K1A 0K9, Canada
[2] Univ Toronto, Dalla Lana Sch Publ Hlth, Toronto, ON, Canada
[3] Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA
[4] Canadian Expert Panel Tobacco Smoke & Breast Canc, Ottawa, ON, Canada