https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-12-8
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-12-11
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-12-10
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-12-9