1. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
2. Clinical Epidemiology Unit Qilu Hospital of Shandong University Jinan China
3. Chronic Disease Research Institute the Children's Hospital, National Clinical Research Center for Child Health, School of Public Health, School of Medicine, Zhejiang University Hangzhou China
4. Department of Nutrition and Food Hygiene School of Public Health, Zhejiang University Hangzhou China
5. Department of Epidemiology and Health Statistics, Key Laboratory of Ministry of Education for Gastrointestinal Cancer Fujian Medical University Fuzhou China