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[Validity of four questionnaires to assess physical activity in Spanish adolescents].
Martínez-Gómez D, Martínez-De-Haro V, Del-Campo J, Zapatera B, Welk GJ, Villagra A, Marcos A, Veiga OL. Martínez-Gómez D, et al. Among authors: martinez de haro v. Gac Sanit. 2009 Nov-Dec;23(6):512-7. doi: 10.1016/j.gaceta.2009.02.013. Epub 2009 Jun 2. Gac Sanit. 2009. PMID: 19493590 Free article. Spanish.