1. Department of Health Policy and Management, School of Medicine, Keio University, Tokyo, Japan
2. Department of Global Health Policy, Graduate School of Medicine, the University of Tokyo, Tokyo, Japan
3. Department of Health Policy, London School of Economics and Political Science, London, UK
4. Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
5. Institute for Population Health, King’s College London, London, UK