Nilay Özkütük, et al. “Effectiveness of Biofeedback Therapy on Quality of Life in Patients With Dyssynergic Defecation Disorder”. Turkish Journal of Gastroenterology, vol. 32, no. 1, Jan. 2021, pp. 22-29, https://tjg.avesjournals.com/index.php/tjg/article/view/3996.