1. Stanford Center on China’s Economy and Institutions, Freeman Spogli Institute for International Studies, Stanford University, Stanford, California, U.S.A.;
2. School of Education, Henan University, Kaifeng, Henan Province, China
3. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, China
4. Child Health Advocacy Institute, Department of Developmental and Behavioral Pediatrics, National Children's Medical Center, Shanghai Children’s Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, Zhejiang Province, China