https://pubmed.ncbi.nlm.nih.gov/24912386/ https://isappscience.org/ https://pubmed.ncbi.nlm.nih.gov/17498234/ https://elifesciences.org/articles/05835 https://pubmed.ncbi.nlm.nih.gov/31143070/ https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2020.00718/full https://www.tandfonline.com/doi/full/10.1080/21505594.2018.1464362#abstract https://www.mdpi.com/2076-2607/8/9/1294 https://pubmed.ncbi.nlm.nih.gov/27435998/ https://www.mdpi.com/2072-6643/12/7/1952 https://nutriciaprofessionals.gr/wp-content/uploads/2021/01/Biotics-Book.pdf https://onlinelibrary.wiley.com/doi/full/10.1155/2018/1756308