1. School of Public Health, Sun Yat-Sen University, Guangzhou, China
2. Centre for the Business and Economics of Health, University of Queensland, Brisbane, QLD, Australia
3. Department of Health Services Research, Care and Public Health Research Institute (CAPHRI), Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands
4. Essenburgh Research & Consultancy, Essenburgh Group, Harderwijk, The Netherlands