1. Department of Psychiatry and Psychotherapy III, University of Ulm, Ulm, Germany
2. Department of Child and Adolescent Psychiatry/ Psychotherapy, University of Ulm, Ulm, Germany
3. Department of Psychiatry and Psychotherapy, University of Mainz, Mainz, Germany
4. Department of Internal Medicine I, University of Ulm, Ulm Germany
5. Division of Gastroenterology, Hepatology and Nutrition, Virginia Commonwealth University Medical School, Richmond, USA