Labrador F. J., Peláez-fernández M. A. . y Raich R. M. . (2008). Comparison of single- and double-stage designs in the prevalence estimation of eating disorders in community samples. The Spanish Journal of Psychology, 11(2), 542-550. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0808220542A