1. Division of Gastroenterology, Taipei Veterans General Hospital, Taipei, Taiwan
2. Institute of Brain Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
3. Division of Gastroenterology, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4. Endoscopy Center for Diagnosis and Treatment, Taipei Veterans General Hospital, Taipei, Taiwan
5. Division of Gastrointestinal and Liver Disease, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California
6. Division of Gastroenterology and Hepatology, Department of Medicine, University of California San Francisco, San Francisco, California
7. Department of Psychiatry, University of California San Francisco, San Francisco, California
8. Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
9. Department of Psychiatry, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
10. Department of Family Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
11. Institute of Hospital and Health Care Administration, National Yang Ming Chiao Tung University, Taipei, Taiwan
12. Department of Family Medicine, Taipei Veterans General Hospital, Hsinchu Branch, Hsinchu, Taiwan