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Exposure to traffic noise may result in stress and sleep disturbances. Studies on self‐reported sleep duration and breast cancer risk have found inconsistent results. In a population‐based Danish cohort of 29,875 women aged 50–64 years at enrolment in 1993–1997, we identified 1219 incident, postmenopausal breast cancer cases during follow‐up through 2010. Mean follow‐up time was 12.3 years. Road traffic...
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