%0 Journal Article %T Metformin and breast cancer risk: a meta-analysis and critical literature review %A Col, Nananda %A Ochs, Leslie %A Springmann, Vicky %A Aragaki, Aaron %A Chlebowski, Rowan %J Breast Cancer Research and Treatment %V 135 %N 3 %P 639-646 %@ 0167-6806 %D 2012-07-31 %I Springer US %~ DeepDyve