F. Zurita, M. Cepero González, L. Ruiz Rodríguez, D. Linares Girela, J. Cachón Zagalaz, and F. Zurita Molina, “Age and gender differences in Body Mass Index, ocular, and back disorders in 8-12-year old children”, J. Hum. Sport Exerc., vol. 6, no. 4, pp. 657–672, Dec. 2011.