1. Key Laboratory of Environmental Medicine and Engineering of Ministry of Education, and Department of Nutrition and Food Hygiene, School of Public Health Southeast University Nanjing 210009 P.R. China
2. PepsiCo Inc Barrington Illinois USA
3. Beijing Research Institute for Nutritional Resources Beijing 100000 P.R. China
4. National Institute for Nutrition and Health Center for Disease Control and Prevention Beijing 100000 P.R. China