Sukhmeet S. Panesar is Honorary Fellow, Centre for Population Health Sciences, The University of Edinburgh, Edinburgh, UK

Andrew Carson-Stevens is Clinical Lecturer in Healthcare Improvement, Cochrane Institute of Primary Care and Public Health, Cardiff University School of Medicine, Cardiff, UK

Sarah A. Salvilla is Honorary Fellow, Centre for Population Health Sciences, The University of Edinburgh, Edinburgh, UK

Aziz Sheikh is Professor of Primary Care Research and Development, Co-Director of Centre for Population Health Sciences, The University of Edinburgh, Edinburgh, UK; Visiting Professor of Medicine, Harvard Medical School, Harkness Fellow in Health Policy and Practice, Brigham and Women's Hospital, Harvard Medical School, Boston, USA