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Validity of instruments to measure physical activity may be questionable due to a lack of conceptual frameworks: a systematic review



Validity of instruments to measure physical activity may be questionable due to a lack of conceptual frameworks: a systematic review

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Document Type: Article
Version: Published version
Date: 2011
This document is associated with a Creative Common license © 2011 Gimeno-Santos et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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