Funding for this research was provided by:
Suzhou Municipal Science and Technology Bureau (SYSD2016083)
Text and Data Mining valid from 2019-07-13
Received: 5 March 2019
Accepted: 26 June 2019
First Online: 13 July 2019
Compliance with ethical standards
: All participants provided informed consent, and the study was approved by the ethical institution of the First Affiliated Hospital of Soochow University (no. 2017021).
: The authors declare that they have no conflict of interest.