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A comparison of direct versus self-report measures for assessing physical activity in adults: a systematic review

Stéphanie A Prince*, Kristi B Adamo, Meghan E Hamel, Jill Hardt, Sarah Connor Gorber and Mark Tremblay

International Journal of Behavioral Nutrition and Physical Activity 2008, 5:56  doi:10.1186/1479-5868-5-56