https://fluidsbarrierscns.biomedcentral.com/articles/10.1186/s12987-015-0002-1
https://fluidsbarrierscns.biomedcentral.com/articles/10.1186/2045-8118-12-5
https://fluidsbarrierscns.biomedcentral.com/articles/10.1186/2045-8118-12-4