Funding for this research was provided by:
National Natural Science Foundation of China (81700194)
University Natural Science Research Project of Anhui Province (KJ2016A328)
Scientific Research of BSKY from Anhui Medical University (XJ201511)
Text and Data Mining valid from 2019-11-06
Received: 23 March 2019
Accepted: 25 September 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: This study was carried out in accordance with the principles of the Helsinki Declaration and approved by the ethics committee of the first affiliated and the second affiliated hospitals of Anhui Medical University. Each patient had signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.