Asha, Mohammad Z., and Sundos F. H. Khalil. “Efficacy and Safety of Probiotics, Prebiotics and Synbiotics in the Treatment of Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis”. Sultan Qaboos University Medical Journal [SQUMJ] 20, no. 1 (March 9, 2020): e13–24. Accessed April 15, 2021. https://journals.squ.edu.om/index.php/squmj/article/view/3502.