Lyu, Juncheng
Zhang, Wen
Li, Wei
Wang, Suzhen
Zhang, Jie
Funding for this research was provided by:
National Natural Science Foundation of China (71774119, 81872719)
Health and Family Planning Commission of Shandong Province (2016WS0676)
the Ph.D. Research Fund Project of Weifang Medical University (2017BSQD53)
Social Science Planning and Research Project of Shandong Province (19CJYJ24)
Article History
Received: 1 December 2019
Accepted: 17 April 2020
First Online: 1 May 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Weifang Medical University, and written informed consent was obtained from all participants.
: Not Applicable.
: We certify that no party having a direct interest in the results of the research. All authors declare that they do not have any conflict of interest on this research.