https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-6
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-7
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-9
https://bmcemergmed.biomedcentral.com/articles/10.1186/1471-227X-9-8