Corresponding Author: Kurt Pfannkuche and Benjamin Krausgrill
Center for Physiology and Pathophysiology, Institute of Neurophysiology, University of Cologne;
Dept. III of Internal Medicine, University Hospital of Cologne, Cologne (Germany)
Tel. +49 221 478 6940, +49 221 478 96895, E-Mail kurt.pfannkuche@uni-koeln.de; benjamin.krausgrill@uk-koeln.de