1. School of Economics, New structural economics research center, Nankai University, Tianjin, China
2. School of Economics, Nankai University, Tianjin, China
3. School of Economics, Renmin University of China, Beijing, China
4. Fielding School of Public Health, University of California, Los Angeles, CA, USA
5. School of Economics, The Laboratory for Economic Behaviors and Policy Simulation, Nankai University, Tianjin, China