1. Department of Neurology, Philipps-University Marburg, Marburg, Germany
2. Institute of Medical Sociology and Social Medicine, Philipps-University Marburg, Marburg, Germany
3. Department of Family Medicine, Philipps-University Marburg, Marburg, Germany
4. Vitos Clinic for Psychiatry and Psychotherapy, Marburg and Justus-Liebig-University, Giessen, Germany