Funding for this research was provided by:
National Natural Science Foundation of China (81870481)
Routine Clinical Research Funds of Sun Yat-sen Memorial Hospital (SYS-C-201905)
Text and Data Mining valid from 2020-02-12
Received: 13 May 2019
Accepted: 30 January 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: The hospital ethics committee approved this study (SYSEC-KY-KS-2019-135) and waived the need for patients’ written informed consent. We obtained oral informed consent from patients when we conducted a visit by telephone which was approved by our ethics committee. The study was conducted in accordance with the Declaration of Helsinki (2013).
: Not applicable.
: The authors declare that they have no competing interests.