https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-5
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-6
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-7