PT - JOURNAL ARTICLE AU - Wade, Kaitlin H AU - Richmond, Rebecca C AU - Davey Smith, George TI - Physical activity and longevity: how to move closer to causal inference AID - 10.1136/bjsports-2017-098995 DP - 2018 Jul 01 TA - British Journal of Sports Medicine PG - 890--891 VI - 52 IP - 14 4099 - http://bjsm.bmj.com/content/52/14/890.short 4100 - http://bjsm.bmj.com/content/52/14/890.full SO - Br J Sports Med2018 Jul 01; 52