Suleiman, H. A., S. A. Elamin, A. A. Alobeid, and W. E. Altaib. “Prevalence of Social Anxiety Disorder Among Medical Students from Six Medical Schools in Khartoum State”. Sudan Journal of Medical Sciences (SJMS), Vol. 16, no. 2, June 2021, pp. 223–232, doi:10.18502/sjms.v16i2.9290.