Bu, Z. et al. 2022. Bifidobacteria Was Decreased in Adult Patients With Irritable Bowel Syndrome Based on PCR and Bacterial Culture: A Systematic Review and Meta-Analysis. Turkish Journal of Gastroenterology. 33, 5 (Jan. 2022), 368–376. DOI:https://doi.org/10.5152/tjg.2022.21543.