1. Center for Experimental Economics in Education, Shaanxi Normal University, Xi’an, Shaanxi, China
2. State Key Laboratory of Ophthalmology and Division of Preventive Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
3. Centre for Public Health, School of Medicine, Dentistry, and Biomedical Sciences, Queen’s University Belfast, Ireland
4. Orbis International, New York, New York
5. Rural Education Action Program, Freeman Spogli Institute for International Studies, Stanford University, Palo Alto, California
6. OneSight, Mason, Ohio