Y Wang1, L Wang2, W Qu3. 1. Systems-Oriented Global Childhood Obesity Intervention Program, Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, State University of New York, Buffalo, NY, USA. 2. Department of Biostatistics and Epidemiology, College of Public Health, East Tennessee State University, Johnson City, TN, USA. 3. Key National Laboratory of Public Health Safety, Chinese Ministry of Education; Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.