1. Division of Gastroenterology and HepatologyMayo Clinic College of MedicineRochester MN
2. Division of Biomedical Statistics and Informatics, Department of Health Sciences ResearchMayo Clinic College of Medicine and Mayo Clinic Cancer CenterRochester MN
3. Division of Epidemiology, Department of Health Sciences ResearchMayo Clinic College of Medicine, and Mayo Clinic Cancer CenterRochester MN
4. Department of Medicine, Faculty of MedicineChulalongkorn University and King Chulalongkorn Memorial HospitalThai Red Cross SocietyBangkok Thailand