https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-53
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-51
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-50
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-9-52