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Ramírez-Rivera, D.L., Martínez-Contreras, T., Ruelas, A.L., Henry-Mejia, G., Quizán-Plata, T., Esparza-Romero, J., Haby, M.M. and Díaz-Zavala, R.G. 2021. Effect of an online lifestyle intervention on the BMI z-score of Mexican school children: a protocol for an outcome assessor-blinded pilot randomized controlled trial during the COVID-19 pandemic. Spanish Journal of Human Nutrition and Dietetics. 25, Supl. 2 (Oct. 2021). DOI:https://doi.org/10.14306/renhyd.25.S2.1320.