https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-56
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-60
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-58
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-57
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-61
https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-13-59