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Adolescent's physical activity levels and relatives' physical activity engagement and encouragement: the HELENA study.
Martín-Matillas M, Ortega FB, Ruiz JR, Martínez-Gómez D, Marcos A, Moliner-Urdiales D, Polito A, Pedrero-Chamizo R, Béghin L, Molnár D, Kafatos A, Moreno LA, De Bourdeaudhuij I, Sjöström M; HELENA study. Martín-Matillas M, et al. Eur J Public Health. 2011 Dec;21(6):705-12. doi: 10.1093/eurpub/ckq143. Epub 2010 Oct 8. Eur J Public Health. 2011. PMID: 20935036