1. National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care (CLAHRC) North Thames, Department of Applied Health Research, University College London, London, UK
2. Health Services Research Unit, University of Aberdeen, Aberdeen, UK
3. Medical Research Council (MRC)/Chief Scientist Office (CSO) Social and Public Health Sciences Unit, University of Glasgow, Glasgow, UK
4. Centre for Studies in Family Medicine, Department of Family Medicine, Western University, London, ON, Canada
5. National Institute for Health Research (NIHR) School for Primary Care Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK