[1] Univ Surrey, Sch Hlth & Social Care, Guildford GU2 5XH, Surrey, England
[2] Univ Sussex, Sch Psychol, Brighton, E Sussex, England
[3] Univ Edinburgh, Ctr Populat Hlth Sci, Edinburgh, Midlothian, Scotland
[4] Univ Sheffield, Acad Unit Diabet, Sheffield, S Yorkshire, England
[5] UCL, London, England
[6] AHP Res, Hornchurch, England
[7] Australian Ctr Behav Res Diabet, Melbourne, Vic, Australia
[8] Deakin Univ, Sch Psychol, Ctr Mental Hlth & Wellbeing Res, Burwood, Vic, Australia