Funding for this research was provided by:
the State's Key Project of Research and Development Plan (2017YFC0108300 and 2017YFC0108303)
Text and Data Mining valid from 2019-01-07
Received: 20 August 2018
Revised: 11 November 2018
Accepted: 3 December 2018
First Online: 7 January 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Tao Chen.
: 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• diagnostic or prognostic study• performed at one institution