https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-11-90
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-11-92
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-11-91
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-11-93