1 Department of Psychosomatic Medicine and Psychotherapy, University Hospital Tübingen, Tübingen, Germany.
2 Department for Psychosomatic Medicine, Charité Center for Internal Medicine and Dermatology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Berlin Institute of Health, Humboldt-Universität zu Berlin, Berlin, Germany.
3 Rouen University Hospital - INSERM UMR 1073 / INSERM CIC-CRB 1404, Rouen, France.
4 Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, UCLA/Digestive Diseases Research Core Center, UCLA David Geffen School of Medicine, Los Angeles, CA, United States.
5 VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States.