- Correspondence to Dr Sarah Hopkins, Neurology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA;
- Received October 8, 2019
- Revised January 8, 2020
- Accepted January 17, 2020
- First published February 10, 2020.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.