RT Journal Article SR Electronic T1 Randomised trial of exercise dose in children reduces diabetes risk (as measured by insulin resistance) in both 20-min and 40-min doses JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 147 OP 148 DO 10.1136/eb-2012-101092 VO 18 IS 4 A1 Aaron L Carrel YR 2013 UL http://ebm.bmj.com/content/18/4/147.abstract AB