C I T A T I O N S
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5670148/
https://www.ncbi.nlm.nih.gov/pubmed/27475046
https://www.ncbi.nlm.nih.gov/pubmed/25287761
https://www.ncbi.nlm.nih.gov/pubmed/23651522
https://www.ncbi.nlm.nih.gov/pubmed/28398950
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4124736/
http://oxfordmedicine.com/view/10.1093/med/9780190497996.001.0001/med-9780190497996-chapter-26