Shafaei, H. . “Evaluating the Effectiveness of Neurofeedback Treatment on Depression, Anxiety, Stress and Abdominal Pain in Patients With Chronic Psychosomatic Abdominal Pains”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 02, Mar. 2022, p. 395, doi:10.53350/pjmhs22162395.