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International Physical Activity Questionnaire (IPAQ) and New Zealand Physical Activity Questionnaire (NZPAQ): A doubly labelled water validation.
Maddison R, Ni Mhurchu C, Jiang Y, Vander Hoorn S, Rodgers A, Lawes CM, Rush E
Int J Behav Nutr Phys Act 2007, 4:62
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Reliability and validity of two frequently used self-administered physical activity questionnaires in adolescents
Rangul V, Holmen TL, Kurtze N, Cuypers K, Midthjell K
BMC Medical Research Methodology 2008, 8:47 (15 July 2008)
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