Funding for this research was provided by:
National Natural Science Foundation of China (81670627)
Changzhou Municipal Science and Technology Bureau (CJ20159042)
Changzhou Health and Family Planning Commission Major Sci & Tech Projects of China (ZD201501)
Text and Data Mining valid from 2020-03-19
Received: 24 October 2019
Accepted: 24 February 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Nanjing Medical University, and the written informed consent was also obtained from each participant in advance.
: Not applicable.
: The authors declare that there is no conflict of interests regarding the publication of this paper.