1. School of Public Health, Peking University, Beijing, China
2. Brown School, Washington University in St. Louis, St. Louis, Missouri, USA
3. Center of Health System and Policy, Institute of Medical Information & Library, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
4. Institute of Health Policy, Management, and Evaluation (IHPME), University of Toronto, Toronto, Ontario, Canada
5. Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, England, UK
6. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada