1. Central Division of Analytical Chemistry, Forschungszentrum Jülich, Jülich, Germany
2. Institute of Neurosciences and Medicine, Forschungszentrum Jülich, Jülich, Germany
3. Department of Neurology, Philipps University, Marburg, Germany
4. Institute of Anatomy and Cell Biology, Philipps University, Marburg, Germany
5. Department of Neurology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany