1. Department of Medicine, Division of Gastroenterology and HepatologyStanford UniversityPalo Alto California
2. Department of GastroenterologyKaiser Permanente, Northern CaliforniaSanta Clara California
3. Department of Medical ResearchSchool of Medicine, Fu Jen Catholic UniversityNew Taipei City Taiwan
4. Chinese Hospital San Francisco California
5. C. Wong Clinic San Francisco California
6. CL. Wong Clinic San Francisco California
7. Division of Gastroenterology and HepatologyVeterans Affairs Palo Alto Health Care System Palo Alto California