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Self-reported physical activity in European adolescents: results from the HELENA (Healthy Lifestyle in Europe by Nutrition in Adolescence) study.
De Cocker K, Ottevaere C, Sjöström M, Moreno LA, Wärnberg J, Valtueña J, Manios Y, Dietrich S, Mauro B, Artero EG, Molnár D, Hagströmer M, Ruiz JR, Sarri K, Kafatos A, Gottrand F, De Henauw S, Maes L, De Bourdeaudhuij I; HELENA Study Group. De Cocker K, et al. Among authors: ruiz jr. Public Health Nutr. 2011 Feb;14(2):246-54. doi: 10.1017/S1368980010000558. Epub 2010 Mar 18. Public Health Nutr. 2011. PMID: 20236565
Impact of the choice of threshold on physical activity patterns in free living conditions among adolescents measured using a uniaxial accelerometer: the HELENA study.
Vanhelst J, Béghin L, Salleron J, Ruiz JR, Ortega FB, Ottevaere C, Molnar D, Kafatos A, Manios Y, Widhalm K, Casajus JA, Mauro B, Sjöström M, Gottrand F. Vanhelst J, et al. Among authors: ruiz jr. J Sports Sci. 2014;32(2):110-5. doi: 10.1080/02640414.2013.809473. Epub 2013 Jul 26. J Sports Sci. 2014. PMID: 23885661