1.
Ceballos Gurrola O, Álvarez Bermúdez J, Medina Rodríguez R. Physical activity and gender: comparative study between adolescents from Monterrey, Mexico and Zaragoza, Spain. MHS [Internet]. 31Dec.2009 [cited 25Feb.2021];6(2). Available from: https://www.revistas.una.ac.cr/index.php/mhsalud/article/view/367