Published on in Vol 21, No 3 (2019): March
1 Centre for Population Health Sciences, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
2 Bristol Medical School, University of Bristol, Bristol, United Kingdom
3 National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care West, University Hospitals Bristol NHS Foundation Trust, Bristol, United Kingdom
4 Family Medicine and Primary Care, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
5 Department of Primary Care and Public health, School of Public health, Imperial College London, London, United Kingdom