Erol Ursavas, F., and M. Catakli. “The Effect of Diaphragmatic Breathing Exercise on Pain, Anxiety, and Depression in Patients Undergoing Total Knee Replacement: A Randomized Controlled Trial”. Annals of Medical Research, vol. 27, no. 9, May 2021, pp. 2408-13, http://www.annalsmedres.org/index.php/aomr/article/view/934.