[1] Cardiff Univ, Ctr Trials Res, Cardiff, Wales
[2] UCL Great Ormond St Inst Child Hlth, London, England
[3] Univ Leeds, Leeds Inst Clin Trials Res, Clin Trials Res Unit, Leeds, England
[4] Univ Oxford, Clin Trial Serv Unit, Oxford, England
[5] Univ Oxford, Epidemiol Studies Unit, Nuffield Dept Populat Hlth, Oxford, England
[6] Cardiff Univ, DECIPHer Ctr Dev Evaluat, Complex & Implementat Publ Hlth Improvement, Cardiff, Wales
[7] UCL, Inst Clin Trial & Methodol, MRC Clin Trials Unit UCL, London, England
[8] BHF Data Sci Ctr, Hlth Data Res UK, London, England