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APA Citation
Vanhelst, J., Béghin, L., Duhamel, A., De Henauw, S., Molnar, D., Vicente-Rodriguez, G., Manios, Y., Widhalm, K., Kersting, M., Polito, A., Ruiz, J. R., Moreno, L. A., & Gottrand, F. (2017). relationship between school rhythm and physical activity in adolescents: the HELENA study. Journal of sports sciences, 35(16), 1666–1673. http://access.bl.uk/ark:/81055/vdc_100046450700.0x00001c