RT Journal Article SR Electronic T1 Benefits of exercise therapy for chronic diseases JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 3 OP 4 DO 10.1136/bjsm.2005.021717 VO 40 IS 1 A1 U M Kujala YR 2006 UL http://bjsm.bmj.com/content/40/1/3.abstract AB