Funding for this research was provided by:
National Natural Science Foundation of China (81771811, 81971588, 81571647, 81620108015)
Capital clinical special program (Z191100006619021)
Text and Data Mining valid from 2019-11-06
Received: 21 June 2019
Revised: 21 August 2019
Accepted: 19 September 2019
First Online: 6 November 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Minjie Lu.
: 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• multicenter study