[1] Mayo Clin, Dept Neurol, Rochester, MN USA
[2] Mayo Clin, Dept Radiol, Rochester, MN USA
[3] Mayo Clin, Ctr Multiple Sclerosis & Autoimmune Neurol, Rochester, MN USA
[4] Mayo Clin, Womens Hlth Res Ctr, Rochester, MN USA
[5] Mayo Clin, Dept Quantitat Hlth Sci, Rochester, MN USA
[6] Univ Virginia, Dept Neurol, Charlottesville, VA USA