1. Institute of Epidemiology and Social Medicine, University of Münster , Münster , Germany
2. Clinic of Radiology, University Hospital Münster , Münster , Germany
3. Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Medical Campus University of Oldenburg , Oldenburg , Germany
4. Research Center Neurosensory Science, University of Oldenburg , Oldenburg , Germany
5. Johannes Keller General Practice , Greven , Germany
6. Medical Park/Neurological Clinic Reithofpark , Bad Feilnbach , Germany