Gascón, M. B., Rojas, C. R., Lopez, G. W., Crawford, P., & Cruz, A. J. (2013). Assessing the Validity of a Physical Activity Questionnaire Developed for Parents of Preschool Children in Mexico. Journal of Health, Population and Nutrition, 30(4), 439–446. https://doi.org/10.3329/jhpn.v30i4.13327