. 2014 Dec 9;83(24):2262–2268. doi: 10.1212/WNL.0000000000001069
© 2014 American Academy of Neurology
This is an open access article distributed under the terms of the Creative Commons Attribution-Noncommercial No Derivative 3.0 License, which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.