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Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP Diet and Health Study

Tricia M Peters*, Steven C Moore, Gretchen L Gierach, Nicholas J Wareham, Ulf Ekelund, Albert R Hollenbeck, Arthur Schatzkin and Michael F Leitzmann

BMC Cancer 2009, 9:349  doi:10.1186/1471-2407-9-349