Funding for this research was provided by:
National Key R&D Program of China, Precision medicine program——Cohort study on nervous system diseases (2017YFC0907700)
Received: 4 November 2019
Accepted: 9 January 2020
First Online: 20 February 2020
Ethics approval and consent to participate
: Due to the retrospective and noninterventional nature of the study, informed consent was not required. We confirm that we have read the Journal’s position on issues involved in ethical publication and affirm that this article is consistent with those guidelines.
: Not applicable.
: The authors declare that they have no competing interests.