https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-49
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-50
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-48
https://bmccomplementmedtherapies.biomedcentral.com/articles/10.1186/1472-6882-8-47