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Studies:
https://www.ncbi.nlm.nih.gov/pubmed/2...
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.ncbi.nlm.nih.gov/pmc/arti...