Funding for this research was provided by:
National Natural Science Foundation of China (81300687)
Key Research and Development Program of Changzhou (CJ20140061)
Applied Basic Research Program of Changzhou (CJ20180044)
Key Research and Development Program of Jiangsu Province (BE2016659)
Major Science and Technology Project of Changzhou Health and Family planning commission (ZD201512)
Received: 18 March 2019
Accepted: 18 September 2019
First Online: 10 October 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Third Affiliated Hospital of Soochow University, and in accordance to the Declaration of Helsinki. Written informed consent was obtained by each participant.
: Not applicable.
: The authors declare that they have no competing interests.