1. Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
2. Laboratory of Toxicological Research and Risk Assessment for Food Safety, Peking University, Beijing 100191, China
3. Center for Global Noncommunicable Diseases, RTI International, Durham, NC 12106, USA
4. Institute of Food and Nutrition Development, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
5. School of Nursing, Peking University, Beijing 100191, China
6. Beijing Center for Disease Control and Prevention, Beijing 100191, China
7. Child Health Development Section, United Nations International Children’s Emergency Fund (UNICEF) Office for China, Beijing 100600, China