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- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2800928/
- https://pubmed.ncbi.nlm.nih.gov/18955292/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6055023/
- https://pubmed.ncbi.nlm.nih.gov/22087795/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003790/
- https://pubmed.ncbi.nlm.nih.gov/17643866/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4220499/
- https://pubmed.ncbi.nlm.nih.gov/23723641/
- https://pubmed.ncbi.nlm.nih.gov/23243445/
- https://pubmed.ncbi.nlm.nih.gov/21495900/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5984022/
- https://www.tandfonline.com/doi/full/10.1080/13880200902755234
- https://pubmed.ncbi.nlm.nih.gov/19051352/
- https://www.tandfonline.com/doi/full/10.1080/10942912.2016.1207188
