[1] Univ Cambridge, Behav Sci Grp, Primary Care Unit, Dept Publ Hlth & Primary Care, Cambridge, England
[2] Tees Esk & Wear Valley Hertfordshire Partnership, St Albans, England
[3] Univ Cambridge, Mobile Syst Grp, Dept Comp Sci & Technol, Cambridge, England
[4] Univ East Anglia, Sch Pharm, Norwich, Norfolk, England
[5] Univ East Anglia, Sch Hlth Sci, Norwich, Norfolk, England