https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-8-14
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-8-13
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-8-15
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-8-12