Funding for this research was provided by:
National Natural Science Foundation of China (81301217)
Tianjin Research Program of Application Foundation and Advanced Technology (14JCZDJC57000)
Text and Data Mining valid from 2018-04-13
Received: 26 June 2017
Revised: 13 February 2018
Accepted: 22 February 2018
First Online: 13 April 2018
Compliance with ethical standards
: The scientific guarantor of this publication is Dong Li.
: The authors of this manuscript declare relationships with the following companies: Gu Jun is on the speakers' bureau of Siemens Healthineers, Computed Tomography division. The other 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.
: • prospective• case-control study• performed at one institution