1. Department of GastroenterologyShanghai Jiaotong University Shanghai China
2. JC School of Public Health and Primary Care, Faculty of MedicineThe Chinese University of Hong Kong Hong Kong
3. School of Public HealthSun Yat‐sen University Guangzhou China
4. General Practice and Primary Care, Institute of Health and WellbeingUniversity of Glasgow Glasgow UK
5. Li Ka Shing Institute of Health Sciences, Faculty of MedicineThe Chinese University of Hong Kong Hong Kong
6. Institute of Digestive Disease, Faculty of MedicineThe Chinese University of Hong Kong Hong Kong
7. State Key Laboratory of Digestive Disease, Faculty of MedicineThe Chinese University of Hong Kong Hong Kong