RT Journal Article SR Electronic T1 Induced abortion as an independent risk factor for breast cancer. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 465 OP 467 DO 10.1136/jech.51.4.465 VO 51 IS 4 A1 M Blettner A1 J Chang-Claude A1 T Scheuchenpflug YR 1997 UL http://jech.bmj.com/content/51/4/465.abstract AB