Funding for this research was provided by:
National Natural Science Foundation of China (81600152)
Natural Science Foundation of Jiangsu Province (BK20160194)
Jiangsu Province Young Medical Talents (QNRC2016155)
Text and Data Mining valid from 2019-06-08
Received: 11 October 2018
Accepted: 27 May 2019
First Online: 8 June 2019
Ethics approval and consent to participate
: Because this is a retrospective study, all recruited patients were informed and verbal consent was obtained in accordance with the requirements of the Declaration of Helsinki, and the research project was approved by the review boards of Jiangnan University, Affiliated Hospital of Jiangnan and Nantong Universities.
: Not applicable.
: The authors declare that they have no competing interests.