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The study was carried out by researchers from the Universities of London and Manchester, and was funded by the Medical Research Council, Cancer Research UK and the National Institute of Health Research, as well as the Eve Appeal.
The study was published in the peer-reviewed medical journal BMJ Open. As the name suggests, this is an open-access journal, so the study can be read for free online.
The paper was widely covered in the UK media. Coverage was fair, if uncritical.
Several headlines gave the impression that going up a single skirt size would raise breast cancer risk by 33%. Such a rise in risk would only be expected if a person went up a dress size every decade from their mid-twenties to when they were over 50 years old – the youngest age of the women recruited to the study.
Several media sources included useful comments from independent experts.