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To compare overall survival between women with unilateral breast cancer (UBC) and contralateral breast cancer (CBC). Women with UBC (N = 182,562; 95 %) and CBC (N = 8,912; 5 %) recorded in the Netherlands Cancer Registry between 1989 and 2008 were included and followed until 2010. We incorporated CBC as a time-dependent covariate to compute the overall mortality rate ratio between women with CBC and...
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