Funding for this research was provided by:
National Natural Science Foundation of China (81702419, 81673241, 81200634)
Nantong Municipal Commission of Health and Family Planning (WQ2016083)
Jiangsu Provincial Department of Education (KYCX17_1934)
Received: 13 December 2019
Accepted: 10 February 2020
First Online: 14 February 2020
Ethics approval and consent to participate
: Informed consent was obtained from each participant. This research was in compliance with the Declaration of Helsinki and approved by the Medical Ethics Committee and Animal Ethics Committee of Affiliated Hospital of Nantong University.
: All the authors in this paper consent to publication of the work.
: The authors declare no conflict of interest.