[1] Univ Teesside, Hlth & Social Care Inst, Middlesbrough TS1 3BA, Tees Valley, England
[2] UCL, Dept Epidemiol & Publ Hlth, Clin Epidemiol Grp, London WC1E 6BT, England
[3] Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 5UX, Merseyside, England