Funding for this research was provided by:
National Natural Science Foundation of China (No. 81770491)
Ministry of Education Innovation Team Development Program of China (No. IRT16R57)
Young Talent Recruiting Plans of Xi’an Jiaotong University
Received: 3 May 2018
Accepted: 20 February 2019
First Online: 7 March 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the First Affiliated Hospital of Xi’an Jiaotong University (XJTU1AF2015LSL-057). The patient’s informed written consent to analysis of their medical records was waived due to the retrospective nature of this study. And no further permission from the hospital was required.
: Not applicable.
: The authors declare that they have no competing interests.
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