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References:
1 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4499388/
2 https://www.ncbi.nlm.nih.gov/pubmed/10999435
3 https://www.ncbi.nlm.nih.gov/pubmed/12218354
4 https://www.ncbi.nlm.nih.gov/pubmed/24929543
5 https://www.hindawi.com/journals/ecam/2015/824185/
6 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4425174/