RT Journal Article SR Electronic T1 A 16-week tai chi programme prevented falls in healthy older adults JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 54 OP 54 DO 10.1136/ebm.13.2.54 VO 13 IS 2 YR 2008 UL http://ebm.bmj.com/content/13/2/54.abstract AB