[1] Cardiff Univ, Div Populat Med, Cardiff CF10 3AX, S Glam, Wales
[2] UCL, Inst Child Hlth, London WC1E 6BT, England
[3] Macquarie Univ, Australian Inst Healthcare Innovat, Macquarie, Australia
[4] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Biostat & Hlth Informat, London WC2R 2LS, England
[5] Boston Childrens Hosp, Inst Professionalism & Eth Practice, Boston, MA USA
[6] Boston Childrens Hosp, Dept Anesthesia, Boston, MA USA
[7] Harvard Univ, Harvard Med Sch, Boston, MA 02115 USA
[8] Inst Healthcare Improvement, Cambridge, MA USA
[9] Univ Nottingham, Div Gen Practice, Nottingham NG7 2RD, England
[10] Univ Edinburgh, Usher Inst Populat Hlth Sci & Informat, Edinburgh EH8 9YL, Midlothian, Scotland
[11] London Sch Hyg & Trop Med, Dept Noncommunicable Dis Epidemiol, London, England
[12] Univ British Columbia, Dept Family Practice, Vancouver, BC, Canada