- Correspondence to Dr Li Yang, Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, Tianjin 300052, China;
- Received 2 May 2017
- Revised 18 September 2017
- Accepted 22 September 2017
- Published online 9 October 2017.
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.