1. Department of Neurology; 200 First Street Southwest Rochester Minnesota 55905 USA
2. Department of Laboratory Medicine and Pathology; Mayo Clinic and Mayo Foundation; Rochester Minnesota USA
3. Division of Autoimmune Neurology; Mayo Clinic and Mayo Foundation; Rochester Minnesota USA
4. Division of Biostatistics; Mayo Clinic and Mayo Foundation; Rochester Minnesota USA
5. Menzies Institute for Medical Research; University of Tasmania; Tasmania Australia