. 2017 Aug 22;89(8):820–829. doi: 10.1212/WNL.0000000000004259
Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1. Flow chart of study selection.
