Morera-Castro, M., Jiménez-Díaz, J., Araya-Vargas, G. and Herrera-González, E. 2018. Pictorial Children’s Physical Activity Questionnaire: design and validation. Actualidades Investigativas en Educación. 18, 2 (May 2018). DOI:https://doi.org/10.15517/aie.v18i2.33127.