1. Division of Gastrointestinal and Liver Diseases, Department of Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA
2. Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
3. Division of Psychiatry, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4. Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
5. Department of Psychiatry, University of California San Francisco, San Francisco, CA, USA
6. Endoscopy Center for Diagnosis and Treatment, and 7Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan