Smoking duration before first childbirth: an emerging risk factor for breast cancer? Results from 302,865 Norwegian women.
Bjerkaas E, Parajuli R, Weiderpass E, Engeland A, Maskarinec G, Selmer R, Gram IT. Smoking duration before first childbirth: an emerging risk factor for breast cancer? Results from 302,865 Norwegian women. Cancer Causes Control. 2013 Jul; 24(7):1347-56.