Funding for this research was provided by:
Ministry of Science and Technology of China, National key research and development project (2016YFC1300400)
CAMS Innovation Fund for Medical Sciences (2016-I2M-1-011)
Text and Data Mining valid from 2019-05-29
Received: 27 February 2019
Revised: 17 April 2019
Accepted: 25 April 2019
First Online: 29 May 2019
Compliance with ethical standards
: The scientific guarantor of this publication is Bin 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.
: Dr. Chuangshi Wang kindly provided statistical advice for this manuscript.
: 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