1. Charité Center for Internal Medicine and Dermatology; Division for General Internal and Psychosomatic Medicine; Charité- Universitätsmedizin Berlin; Berlin; Germany
2. Department of Medicine and Molecular Science; Gunma University Graduate School of Medicine; Maebashi; Japan
3. Department of Medicine; CURE Digestive Diseases Research Center and Center for Neurobiology of Stress; Digestive Diseases Division UCLA and VA Greater Los Angeles Healthcare System; Los Angeles; CA; USA