Funding for this research was provided by:
Health and Family Planning Commission of Shandong Province (2017WS555)
Received: 24 April 2020
Accepted: 15 June 2020
First Online: 27 June 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Binzhou Medical University Hospital (No. 2018-WST-2017WS555).
: Not applicable.
: The authors declare that there is no conflict of interest related to this study.