https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-73
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-75
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-77
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-81
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-79
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-83
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-85
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-74
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-76
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-80
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-78
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-82
https://bmcsurg.biomedcentral.com/articles/10.1186/1471-2482-14-84