1. Institute of Medical Psychology & Behavioral Immunobiology; University Hospital Essen; University of Duisburg-Essen; Essen Germany
2. Integrative Gastroenterology; Clinic for Internal and Integrative Medicine; Kliniken Essen-Mitte; Essen Germany
3. Institute of Diagnostic and Interventional Radiology and Neuroradiology; University Hospital Essen; University of Duisburg-Essen; Essen Germany