https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6196513/
https://www.ncbi.nlm.nih.gov/pubmed/28154970
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6011453/
http://onlinelibrary.wiley.com/doi/10.1002/ana.25131/epdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035422/
https://onlinelibrary.wiley.com/doi/abs/10.1111/ene.13180
https://www.ncbi.nlm.nih.gov/pubmed/28166327
https://www.ncbi.nlm.nih.gov/pubmed/28628235
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5471489/
http://casereports.bmj.com/content/2017/bcr-2016-218893.full