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An adapted version of the long International Physical Activity Questionnaire (IPAQ-L): construct validity in a low-income, multiethnic population study from Oslo, Norway
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* Corresponding author: Sidsel Graff-Iversen sgri@fhi.no
International Journal of Behavioral Nutrition and Physical Activity 2007, 4:13 doi:10.1186/1479-5868-4-13
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