1. Department of Nephrology and Rheumatology; Georg-August-University Göttingen; Germany
2. Department of Neurology; Georg-August-University Göttingen; Germany
3. Department of Neurology, Medical Healthcare Centre Kempten; Kempten-Allgäu Germany
4. Neurological Hospital Dietenbronn; Schwendi Germany
5. Department of Medical Statistics; Georg-August-University Göttingen; Göttingen Germany