DepartmentofGastroenterology,PekingUniversityFirstHospital,Beijing,China//DepartmentofMedicine,FacultyofMedicine,UniversityofHongKong,HongKong,China//ContributedEquallytoThisWork;
DepartmentofMedicine,FacultyofMedicine,UniversityofHongKong,HongKong,China;
DepartmentofMedicine,FacultyofMedicine,UniversityofHongKong,HongKong,China//contributedEquallytoThisWord;