1. Department of Cancer Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Epidemiology and Biostatistics, The Children's Hospital, National Clinical Research Center for Child Health Zhejiang University School of Medicine Hangzhou China
3. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute Rockville Maryland USA