[1] Univ Lancaster, Div Hlth Res, Lancaster, England
[2] Univ Liverpool, Inst Hlth Psychol & Soc, Liverpool L69 3BX, Merseyside, England
[3] Auckland Univ Technol, Ctr Phys Act & Nutr, Auckland, New Zealand
[4] UCL, MRC Unit Lifelong Hlth & Ageing, London, England
[5] Univ Manchester, Sch Social Sci, Manchester, Lancs, England
[6] Univ St Andrews, Dept Geog & Sustainable Dev, St Andrews, Fife, Scotland