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  1. pdf2019NewMeShHeadingsSingleColumn.pdf 
    https://www.nlm.nih.gov/.../2019NewMeShHeadingsSingleColumn.pdf
    ... and Tree Locations Sodium Citrate Sodium salts of citric acid that are used as buffers and food preservatives. ... in the prevention of KIDNEY STONES. Tree locations: Citric Acid D02.241.081.901.434.249.875 Sodium ...
  2. pdf2019NewMeShHeadings.pdf 
    https://www.nlm.nih.gov/mesh/2019/download/2019NewMeShHeadings.pdf
    ... and Tree Locations Sodium Citrate Sodium salts of citric acid that are used as buffers and food preservatives. ... in the prevention of KIDNEY STONES. Parent Heading: Citric Acid D02.241.081.901.434.249.875 Sodium ...