Breast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83 000 women with breast cancer from 16 countries

Valerie Beral(University of Oxford), Gillian Reeves(University of Oxford), Diana Bull(Cancer Research UK), Richard Peto(University of Oxford), Richard Doll(St Thomas' Hospital)
The Lancet
March 1, 2004
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