Open Access Research article

Reported frequency of physical activity in a large epidemiological study: relationship to specific activities and repeatability over time

Miranda EG Armstrong*, Benjamin J Cairns, Jane Green, Gillian K Reeves, Valerie Beral and The Million Women Study Collaborators

BMC Medical Research Methodology 2011, 11:97 doi:10.1186/1471-2288-11-97

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