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Levels of physical activity among a nationally representative sample of people in early old age: results of objective and self-reported assessments

Rajna Golubic*, Kathryn R Martin, Ulf Ekelund, Rebecca Hardy, Diana Kuh, Nicholas Wareham, Rachel Cooper, Soren Brage and On behalf of the NSHD scientific and data collection teams

International Journal of Behavioral Nutrition and Physical Activity 2014, 11:58  doi:10.1186/1479-5868-11-58

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