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- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4265710/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403313/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2581754/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3886767/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5579659/
- https://www.sciencenewsforstudents.org/article/coughing-phlegm-water-key
- https://www.psychologytoday.com/intl/articles/200304/vitamin-c-stress-buster
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