Beecher Grayson, Kotylak Trevor, Johnston Wendy S
From the Departments of Medicine (Neurology) (G.B., W.S.J.) and Radiology & Diagnostic Imaging (T.K.), University of Alberta, Edmonton, Canada.
Neurology. 2017 May 23;88(21):e204. doi: 10.1212/WNL.0000000000003964.