This AJMC® Clinical Brief provides key information regarding a study by van Schaik et al, the results of which were originally published in Neurology Neuroimmunology & Neuroinflammation (doi:10.1212/NXI.0000000000000590). The authors of the original publication are Ivo N. van Schaik, MD; Orell Mielke, MD; Vera Bril, MD; Nan van Geloven, PhD; Hans-Peter Hartung, MD; Richard A. Lewis, MD; Gen Sobue, MD; John-PhilipLawo, Diplom; Michaela Praus, Diplom; Billie L. Durn, BS; David R. Cornblath, MD; and Ingemar S. J. Merkies, MD; the PATH study group.