An Observational Study of the Health Benefits of Yoga or Tai Chi Compared With Aerobic Exercise in Community-Dwelling Middle-Aged and Older Adults. Author: Siddarth D, Siddarth P, Lavretsky H. Affiliation: Harvard-Westlake School, North Hollywood, California. Conference/Journal: Am J Geriatr Psychiatry. Date published: 2013 May 1 Other: Pages: S1064-7481(13)00082-1 , Special Notes: doi: 10.1016/j.jagp.2013.01.065. , Word Count: 1 PMID: 23642461