Leon-Girón, L. F., Betancourt Cañas, J., Orozco-Chamorro, C. M., Cabra-Bautista, G. P., & Calvache, J. A. (2017). Assessment of preoperative anxiety in patients under general anesthesia. observational study. RFS Revista Facultad De Salud, 9(1), 27–34. https://doi.org/10.25054/rfs.v9i1.1990