Pérez-Fuentes, M., Molero, M., Mercader, I., Soler Flores, F., Barragán, A., Calzadilla, Y., & Gázquez, J. (2018). Perceived health and real health: prevalence among persons aged 60 and older. Enfermería Universitaria, 12(2). https://doi.org/10.1016/j.reu.2015.03.002