[0] https://www.ncbi.nlm.nih.gov/pubmed/6147796
[1] https://www.ncbi.nlm.nih.gov/pubmed/19465812
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4816010/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2712270/
[0] https://www.ncbi.nlm.nih.gov/pubmed/6147796
[1] https://www.ncbi.nlm.nih.gov/pubmed/19465812
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4816010/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2712270/