Funding for this research was provided by:
National Natural Science Foundation of China (81871321, 81370035)
The National Key R&D Program of China (2017YFC1308703, 2016YFE0103000)
The Youth Fund of the National Natural Science Foundation of China (81501618, 81501470)
Text and Data Mining valid from 2018-10-15
Received: 28 May 2018
Revised: 21 August 2018
Accepted: 19 September 2018
First Online: 15 October 2018
Compliance with ethical standards
: The scientific guarantor of this publication is Prof. Li FAN.
: 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.
: Prof. Jian Lu (Department of Statistics, Second Military Medical University) kindly provided statistical advice for this manuscript.
: Written informed consent was waived by the Institutional Review Board.
: An Institutional Review Board approval was obtained.
: • Retrospective• Diagnostic or prognostic study• Performed at one institution