1. Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Graduate School of the Chinese Academy of Sciences, Shanghai 200031, China
2. Department of Nutrition, Harvard School of Public Health, Boston, MA 02115
3. Huadong Hospital, Fudan University, Shanghai 200444, China
4. School Hospital, Shanghai University, Shanghai 200040, China
5. Department of Nutrition Sciences, University of Alabama, Birmingham, AL 35294-3360
6. Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115
7. Channing Laboratory, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115