TY - JOUR A1 - Strand, B.H. A1 - Tverdal, A. A1 - Claussen, B. A1 - Zahl, P.H. T1 - Is birth history the key to highly educated women's higher breast cancer mortality? A follow-up study of 500,000 women aged 35-54 Y1 - 2005 DO - 10.1002/ijc.21239 JF - International Journal of Cancer VL - 117 IS - 6 SP - 1002 EP - -1006 ER -