1. Department of Neuroradiology Heidelberg University Hospital Heidelberg Germany
2. Department of Addictive Behavior and Addiction Medicine Central Institute of Mental HealthMedical Faculty Mannheim/Heidelberg University Mannheim Germany
3. Department of Neurology Heidelberg University Hospital Heidelberg Germany
4. Department of Neurology University of Michigan Ann Arbor Michigan USA
5. Department of Internal Medicine Spital Walenstadt Walenstadt Switzerland
6. Division of Experimental Radiology Department of Neuroradiology Heidelberg University Hospital Heidelberg Germany