[1] Univ Glasgow, Med Res Council, Chief Scientist Off Social & Publ Hlth Sci Unit, Glasgow, Lanark, Scotland
[2] NHS Grampian, JJR McLeod Diabet Ctr, Aberdeen, Scotland
[3] Univ Strathclyde, Phys Act & Hlth Res Grp, Glasgow, Lanark, Scotland
[4] Univ Edinburgh, Phys Act Hlth Res Ctr, Edinburgh, Midlothian, Scotland
[5] NHS Grampian, Aberdeen Royal Infirm, Aberdeen, Scotland