https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-10-7
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-10-9
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-10-8