Funding for this research was provided by:
International Science and Technology Cooperation Project of the Changzhou Science and Technology Bureau (CZ20140016)
Text and Data Mining valid from 2019-07-13
Received: 1 February 2019
Accepted: 6 July 2019
First Online: 13 July 2019
Compliance with ethical standards
: Authors declare that they have no conflicts of interest related to this paper.
: No personal identifying information was used in the study. Hence, we did not require Institutional Review Board approval or patient informed consent.