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International Physical Activity Questionnaire (IPAQ) and New Zealand Physical Activity Questionnaire (NZPAQ): A doubly labelled water validation
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* Corresponding author: Ralph Maddison r.maddison@ctru.auckland.ac.nz
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International Journal of Behavioral Nutrition and Physical Activity 2007, 4:62 doi:10.1186/1479-5868-4-62