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Validity and reproducibility of a physical activity questionnaire for older adults: questionnaire versus accelerometer for assessing physical activity in older adults.
Clin Epidemiol. 2012;4:171-80. doi: 10.2147/CLEP.S30848. Epub 2012 Jul 16.
Clin Epidemiol. 2012.
PMID: 22866018
Free PMC article.
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