1. China Center for Health Development Studies, Peking University, Beijing, China
2. Stanford Center on China’s Economy and Institutions, Stanford University, Palo Alto, CA, USA
3. Center for Experimental Economics in Education, Shaanxi Normal University, Xi’an, Shaanxi, China
4. Department of Health Policy and Management, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. Department of Economics, University of Southern California, Los Angeles, CA, USA