Medina Medina K, Fernández Rojas X, Ureña Retana I, Reyes Chaves J. Environmental factors of two schools with different prevalence of childhood obesity in La Union County, 2015. PSM [Internet]. 2017Jun.30 [cited 2024Nov.29];15(1). Available from: https://revistas.ucr.ac.cr/index.php/psm/article/view/26412