http://harvardmagazine.com/2010/01/researchers-study-tai-chi-benefitshttp://www.health.harvard.edu/newsletters/Harvard_Womens_Health_Watch/2009/May/The-health-benefits-of-tai-chihttp://omnicrone1.typepad.com/katethoughts/2010/08/harvard-medical-school-recommends-tai-chiagain.html
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