https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-39
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-40
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-38
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-41