CITATION STYLE
Gimeno-Santos, E., Frei, A., Dobbels, F., Rüdell, K., Puhan, M. A., & Garcia-Aymerich, J. (2011). VALIDITY OF INSTRUMENTS TO MEASURE PHYSICAL ACTIVITY MAY BE QUESTIONABLE DUE TO A LACK OF CONCEPTUAL FRAMEWORKS: A SYSTEMATIC REVIEW. ISEE Conference Abstracts, 2011(1). https://doi.org/10.1289/isee.2011.01659
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