https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-57
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-56
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-59
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-58