Reuters
http://www.reuters.com/article/idUSTRE67H5I520100818
New York Times
http://www.nytimes.com/2010/08/19/health/19taichi.html?_r=1&src=me&ref=general
New England Journal or Medicine
http://www.nejm.org/doi/pdf/10.1056/NEJMoa0912611
Medical News Today
http://www.medicalnewstoday.com/articles/102256.php