1. Institute of Reproductive
and Child Health/Ministry of Health Key Laboratory of Reproductive
Health, School of Public Health, Peking University, Beijing 100191, People’s Republic of China
2. Laboratory for
Earth Surface Processes, College of Urban and Environmental
Sciences, Peking University, Beijing 100871, People’s Republic of China
3. Dell Pediatric Research
Institute, Department of Nutritional Sciences, University of Texas at Austin, Austin, Texas 78723, United States