1. Departments of Neurophysiology, Heinrich‐Heine‐Universität, PO Box 101007, D‐40001 Düsseldorf, Germany
2. Departments of Gastroenterology, Hepatology and Infectiology, Heinrich‐Heine‐Universität, PO Box 101007, D‐40001 Düsseldorf, Germany
3. Departments of Brain Research Institute, Russian Academy of Medical Sciences, Moscow 103064, Russia