Bibliographical noteFunding Information:
N. Zalewski, A. Rabinstein, E. Wijdicks, and G. Petty report no disclosures relevant to the manuscript. S. Sean Pittock has received no royalties to date but may accrue revenue for patents relating to AQP4 antibodies for diagnosis of neuromyelitis optica and AQP4 autoantibody as a cancer marker. He receives research support from the Guthy-Jackson Charitable Foundation, Alexion Pharmaceuticals, Inc., and the NIH (R01 NS065829). W. Mantyh and E. Flanagan report no disclosures relevant to the manuscript. Go to Neurology.org/N for full disclosures.