Funding for this research was provided by:
Foundation for the National Institutes of Health (R01 NS095562, R01 NS090464)
National Natural Science Foundation of China (81730049, 81801666)
Text and Data Mining valid from 2019-01-07
Received: 13 August 2018
Revised: 31 October 2018
Accepted: 27 November 2018
First Online: 7 January 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Shun Zhang.
: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
: No complex statistical methods were necessary for this paper.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective• observational• performed at one institution