1Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim (CBTM), Heidelberg University, Ludolf-Krehl-Str. 13, D-68167 Mannheim, Germany
2Boehringer Ingelheim Pharma GmbH & Co. KG, Div. Research, Birkendorfer Straße 65, D-88397 Biberach/Riß, Germany