1/
First study (2007) compares Dextromethorphan, Honey, and No Treatment w/Sx improvement best with Honey.
ncbi.nlm.nih.gov/pubmed/18056558
2/
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ncbi.nlm.nih.gov/pubmed/20618098
3/
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ncbi.nlm.nih.gov/pubmed/22869830
4/
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ncbi.nlm.nih.gov/pubmed/23966217
5/
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ncbi.nlm.nih.gov/pubmed/22514552
6/
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ncbi.nlm.nih.gov/pubmed/12379042
8/