
1) Yan, F., & Polk, D. B. (2011). Probiotics and immune health. Current opinion in gastroenterology, 27(6), 496–501.
2) Wan, D., Azad, A., Sarker, M. (2018). Immunomodulatory effect of probiotics on cytokine profiles. BioMed Research International, 2018: 8063647.