[1] Univ Birmingham, Dept Publ Hlth Epidemiol & Biostat, NIHR Horizon Scanning Ctr, Birmingham B15 2TT, W Midlands, England
[2] Worcester Univ, Inst Hlth & Soc, Hlth Psychol, Worcester, MA USA
[3] Keele Univ, Hlth Serv Res Unit, Keele, Staffs, England
[4] Univ Hosp North Staffordshire, Dept Cardiol, Keele, Staffs, England
[5] Keele Univ, Hlth Serv Res Unit, Nephrol, Keele, Staffs, England
[6] Keele Univ, Hlth Serv Res Unit, GP Epidemiol, Keele, Staffs, England