https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-18
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-17
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-19
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-16