References & Studies:
1. https://www.ncbi.nlm.nih.gov/pubmed/19571220
2. https://www.ncbi.nlm.nih.gov/pubmed/23026007
3. https://www.ncbi.nlm.nih.gov/pubmed/16865769
4. https://www.ncbi.nlm.nih.gov/pubmed/19381015
5. https://www.ncbi.nlm.nih.gov/pubmed/12324283
6. https://www.ncbi.nlm.nih.gov/pubmed/15155391
7. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3955571/
8. https://www.ncbi.nlm.nih.gov/pubmed/28832835
9. https://www.ncbi.nlm.nih.gov/pubmed/4050722