1. Department of Anaesthesiology, University Hospital RWTH Aachen, Aachen, Germany
2. Department of Neuroscience and Center for Cell Therapy and Tissue Repair, 2nd Medical Faculty, Prague, Czech Republic
3. Department of Neuroscience, Institute of Experimental Medicine, Academy of Sciences of Czech Republic, Prague, Czech Republic
4. Center for Pain Therapy, St. Vincent Hospital, Düsseldorf Germany