Zurita, Felix, Mar Cepero González, Luis Ruiz Rodríguez, Daniel Linares Girela, Javier Cachón Zagalaz, and Félix Zurita Molina. 2011. “Age and Gender Differences in Body Mass Index, Ocular, and Back Disorders in 8-12-Year Old Children”. Journal of Human Sport and Exercise 6 (4):657-72. https://doi.org/10.4100/jhse.2011.64.09.