1.5 to 2.0 here https://pmc.ncbi.nlm.nih.gov/articles/PMC7684463/
1.5 here https://pmc.ncbi.nlm.nih.gov/articles/PMC4519257/
2.0 here https://www.sciencedirect.com/topics/immunology-and-microbiology/stomach-ph
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1.5 to 2.0 here https://pmc.ncbi.nlm.nih.gov/articles/PMC7684463/
1.5 here https://pmc.ncbi.nlm.nih.gov/articles/PMC4519257/
2.0 here https://www.sciencedirect.com/topics/immunology-and-microbiology/stomach-ph
Checks out
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