1. National Clinical Research Center of Digestive Diseases, Beijing Friendship HospitalCapital Medical University Beijing China
2. Department of Epidemiology and Biostatistics, School of Public HealthPeking University Health Science Centre Beijing China
3. Department of PsychiatryUniversity of Oxford Oxford UK
4. Oxford Health NHS Foundation Trust, Warneford Hospital Oxford UK
5. Department of Mathematics and StatisticsUniversity of Maryland Baltimore County Baltimore Maryland
6. Primary Care Unit, Department of Public Health and Primary Care, School of Clinical MedicineUniversity of Cambridge Cambridge UK
7. Department of Clinical Epidemiology and BiostatisticsMcMaster University Hamilton Ontario Canada
8. Department of Endocrinology and MetabolismPeking University International Hospital Beijing China
9. Department of Population MedicineHarvard Medical School and Harvard Pilgrim Health Care Institute Boston Massachusetts
10. Department of Population MedicineHarvard Medical School Boston Massachusetts