TY - JOUR T1 - Correction JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 819 LP - 819 DO - 10.1136/bjsm.2009.068072corr1 VL - 45 IS - 10 A2 - , Y1 - 2011/08/01 UR - http://bjsm.bmj.com/content/45/10/819.abstract N2 - Nettlefold L, McKay HA, Warburton DER. The challenge of low physical activity during the school day: at recess, lunch and in physical education. Br J Sports Med … ER -