1 Department of Earth Observation Science, Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede 7522, Netherlands; International Initiative on Spatial Lifecourse Epidemiology (ISLE), Enschede, Netherlands. Electronic address: jiapengff@hotmail.com.
2 Global Health Institute, Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an 710061, China; Systems-Oriented Global Childhood Obesity Intervention Program, Fisher Institute of Health and Well-Being, Department of Nutrition and Health Sciences, College of Health, Ball State University, Muncie, IN, USA. Electronic address: youfawang@gmail.com.