1 Department of Neurology, 200 1st St SW, Rochester, MN 55905, USA. Electronic address: lopez.alfonso@mayo.edu.
2 Department of Neurology, 200 1st St SW, Rochester, MN 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, USA.
3 Department of Neurology, 200 1st St SW, Rochester, MN 55905, USA.
4 Department of Neurology, 200 1st St SW, Rochester, MN 55905, USA; Department of Ophthalmology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, USA.