Yumul, R., 		Ahdout, J., 		Goodman, A., 		Elvir Lazo, O., 		Hernandez Conte, A., 		Cook-Wiens, G., 		Cao, X., & 		White, P.
2015 Jul 21.  Assessment Of Preoperative Anxiety Using Visual Facial Anxiety Scale: An Alternative To The Verbal Rating Scale?. Medical Research Archives. [Online] 2:2