. 2018 Dec 21;6(2):e531. doi: 10.1212/NXI.0000000000000531
Copyright © 2018 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. Flow diagram of case and control selection.
